2 Questions: Bullet trajectory compensation and priority of grip training (2-hand/strong/weak)

[asmo]

Do I need to be compensating for bullet trajectory, or are my mistakes simply being magnified at a greater distance...and trajectory hasn't entered the equation yet?

At that distance you do not need to take drop into account.

My normal grip/stance is a right-handed, 2-hand Weaver stance (and cross-dominant, so sight using left eye).

I would put money on that being the reason for the low left hits.

As for stance/grip priorities, without knowing you or your level of ability its hard to judge, but in general I would say: 1) modified weaver, 2) 1-handed weak 3) 1-handed strong