The placement of the flanger is something that makes me curious. I've looked around on the internet and some people swear by placing it before the distortion while others frown upon this. But I don't understand why.quote]
if you place the flanger before the distortion you are likely inviting more noise that's why most players put modulation/time based effects after distortion...if you want a more dramatic flange effect on the distorted signal then you could put the flanger first...it depends on what you're going for...do you want to flange the distorted sound or distort the flanged sound - 6 of one 1/2 dozen of the other? perhaps but the way I look at it is the effect is going to effect the sound it receives so I would let OD and distortion do their thing before the signal reaches things like chorus, flange, delay...that's been my approach and it seems to have served me well...but you should try both and see what you like better and then let us know what you think...
One other thing - I noticed that you have OD after distortion - I would recommend placing your OD before your distortion becasue then the OD could be used to drive the distortion for more gain and volume for solo boosts if you like - even if you don't plan on doing this I would still recommend OD before distortion....that's how I've always done it and that's a pretty common way to chain OD and distortion if you look at pro player's pedal boards who have both...
Hope this helps...cheers