It is really hard to help when you can't watch the boat run or just borrow someone a prop out of your box to try. That said RC boat points out what I was thinking in front loaded weight. Hard to change without major reconstruction.
The only options to change cornering you have in my opinion is working with turn fin placement and fin angles of attack. You might also try some sponson offset to the left. As you move the right sponson closer to the tub you take cornering leverage away from it. Also the boat tracks more left allowing less rudder preload to go straight.
Mic
Mic Halbrehder
IMPBA 8656
NAMBA 1414
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