Re: strings tension
Have you checked the truss rod adjustment on the RG?
Is your trem perfectly balanced? Why can't you get the action as low as your JEM? I recently set up two rgs (one was a 2550). Out of the box the string tension was very different but after setup, almost identical. If the neck bow is different, or the trem tensions are not set right, it will be hard to get the action as low as possible. Make sure the knife edge on your bridge is parallel to the guitar body. (This will be a lot easier if you lock the bridge in the correct position, retune, set action, intonation, then remove the block and fine tune while alternating between tuning and slight spring adjustments).
As mentioned in other posts above, the major factors are scale and string gauge. Since both guitars are the same scale and have the same string gauges you should be able to get the tension pretty much the same, aside from very minor factors such as neck shape / leverage, frets, etc..
Sorry for stating the obvious here but remember that string tension, along with string length and gauge, are how you arrive at the note you want. So with any given string gauge and length/intontation, any change you make to the tension will also change the fundamental note. So the thing about the tuner screw adjustment was silly because even if it worked it would have the same affect as just turning the tuner (which also increases the string tension - duh).
Even though the guitars are the same scale, if the intonation (saddles) are adjusted at different extremes the tensions required to achieve the same note may be noticably different. If this is the case be sure to check the truss rod / neck bow and trem balance, and if you change them, then re-intonate and reset the action and retune.
IF ALL ELSE FAILS... just get lighter gauge strings.
Last edited by metalfrk; 01-16-2008 at 01:04 AM.