One of the major reasons I'm investing in electric power is to avoid the CG change that occurs with fuel usage. I tried pumps but found them to be more hassle than they are worth.

I have a Yak with my 2 stroke OS, tank is probably 3" from the firewall. Engine probably runs a little lean during vertical maneuvers/climbs due to gravity working directly against the fuel draw of the engine.

Balance the plane with the tank empty, and use the rearmost balance point suggested in the manual. You generally will never reach that point in the air due to the fuel off-setting that balance point, but if you do run out you're still within controllable limits.

Balance point is just a recommendation anyway; start off safe and adjust to your liking.