highly UNlikely lateral balance would be THAT far off... (but of course check and fix)
I'm with 600Bob, twist / warp in the fuselage (OR wing) misalignment of the wing mounting..
asymmetry somewhere... (one wing panel longer than the other)
any chance the firewall has LEFT thrust built in? Engine torque will cause a roll to the left typically,
(which is why RIGHT thrust is sometimes used) .. if for some reason the thrust is offset to the left by accident it could cause these symptoms.
maybe one elevator half travels while the other half does not?