Hi Joe,
That is one advantage with E power - having that big battery to move around.
Rule of thumb; ( depending on batt,, size ) The batt,, is from 20% to 25% of the total mass. So moving the pack say 10mm = a CG move of 2 to 2.5mm. (maybe not as much as one would think)

Moving your pack forward 1 inch = 3/16 CG forward.
When I'm testing (searching) like you are right now I make big changes first so as to get a distinct change - say move the CG 1/2 inch at at time till It's too far.
Then you get a zone to zoom in on to make fine adjustments.

Good little thread.

Brian