does anybody know the reason why my truck does this?

Increasing toe-in - increases straight line stability, decreases strg response, and increases strg mid corner and on-power corner exits.

Maybe important for racing, not much significance for bashing unless your straightline stability is poor the way its setup. My E and 2 Tmaxxes all run stock toe which is zero deg.

Are you still using the stock dual strg servo arrangement? Sounds like its time to call TRX and see what advice their CS folks have. I wouldn't be running it with both anyway - I never ran dual strg servos in my G2R. I 'd plug a 200inlb single servo in there, epa it properly and eliminate servo synch as any kind of poss prob. The way this sounds, this should be something simple, not some prob from hades that can't be solved. Its just not that complicated.