Hey man...sorry to hear you're sitll not happy with your sound. But keep at it dont let it get ya down.
Look I'm going to be honest with you, you have to make compromises. There is an old saying that you get what you pay for, and the tones that you want to be hearing come from very expensive setups.
But saying that you dont have to spend a fortune to get a good tone.
If at this stage you are still unhappy, and you have tried the GT2. Then nothing will satidfy you other than a real Tube amp. Sorry if you dont want to hear this but there is a reason all the pro's use them. They sound and feel amazing. Tube amps GIVE you that rock gooey saturation.
I learnt this the hard way and spent a tone of money on cheaper things to try to get a copy of the real sound but all you do is make yourself more unhappy about your sound.
When I found the sansamp it was like a revolation becuase I finally found something that I thought sounding grerat. For me the sansamp was the closest thing to a real amp sound I was going to get until I could afford a Tube amp. If the sansamp isn't cutting it for you then there is not more option for you other than switch to playing acoustic folk rock
Sell all you gear you have now, and just buy a used TUBE amp. Trust me, it will be the best thing you ever did. I mean if you still have problems after that then you really need to look at other things as to what is making your sound not what you want, i.e not gear.
I understand that volume could be an issue (cause it is with me to a certain extent) but there are some tube amps that can sound good at sensible levels. And of course when turned up sound freaking stellar. Or you could get an attenuator.
The one last thing I could suggest that you try would be the line 6 gear. This woulf be the cheaper option, and would definatley give you the sound of a real tube amp but not the feel of one. HOWEVER at the moment by the looks of it you are achieving neither.
I just bought a PODxt for myself, for reocrding direct scrap ideas (And the middle of the night) and for practising when i cant have my amp turned on. And well the sound you can get out of the XT are just mind blowing, it sonuds very very much like a whole bunch of tube amps, but like I said the thing missing with the digital emulation stuff is the "feel" and the rush of glassy air moving from the speaker.
You have been trying to get your sound through that setup for a long time now and it seems to no avail. So i reackon you should start a new.
So really I recommend you do 1 of these 2 things.
Sell everything youj can (excpet your geetar of course
) and buy a cheap used fully TUBE amp. For less than 500 pounds you could get a good marshall or even a boogie dc / studio / rocket if you are lucky enough to find one on the used market (that maybe the other side of 500 but it would be worth it) and i'm telling you your troubles would be over.
Secondly sell everything again and get the PODxt. This would mean you could hae all the sounds you want for a very reasonable price and you get them at any volume. You could just plug into your computer and play it thorugh that. Or alternativley if you gig or play in band then keep the peavey cause the pod stuff sounds better i think through solid state amps than tube amps.
WIth the POD you'd get fantastic sounds and effects in one package for 280 quid, the only thing that you would be sacrificing is that whoompf you get off a tube amp. However you dont have that now anyway like I said....
Lastly I'm sorry man, I mean I sold you the GT2 in good faith and fully believed in what I said. ANd I still do. That pedal is the best sounding amp like pedal I 've ever come across although if you are saying it doesn't have enogh gain then I think we were not on the same waveflength, or you ned to work on your technique a bit. Sorry i dont want to sound patronizing but I think most people would find it difficult to not have enough gain on the GT2. However if its not working for you then liek i said sell it, along with your other pedals and anything you can find..and start from scratch.
I know that a bad worker blames his tools. And I always believeed this, and sure give me a crappy squire with the neck bent out of shape, a crate practise amp and a dodd death metal pedal and I can still make it sound "ok"...well maybe not but you get the idea.
However like any worker you have to HAVE TOOLS to begin with. I mean sometimes I look at some of the stuff out on the market for guitar and they seem more like TOYS instead of tools. I know...I went through a lot of them untill i realised, umm satch and petrucci etc etc...well they wern't going through a digitech multi=board or *insert your favourite el cheapo stomper here* and I ponied up the moolaa to get a WORKING setup.
wow what a long post. I'm sorry dude, I'm not gonna say I feel responsible...but I definatley unserstand what you're going through and I'll help you see the light if I can! lol If you wanna give me a call some time to chat about it over the phone you can do feel free, and If you want sound samples of my amp, or the PODxt etc etc just say, no problem.
Ok then well i'm off