+1
Unless you're always in the hunt for the podium consistently, focus on getting more track time being smooth and not crashing/marshaling, when you can go 5 mins straight going 80% of your fast lap pace without needing help... go to 85%, 90%, 95%... when you crash or lose your line... dial it back. Never be on the ragged edge. Get a rhythm, get a pace of your own, study other people's lines, angle of attacking the jump, how they land, etc.
Expensive parts and small equipment trick/boosts are a tiny part of the equation compared to having driving skill. A good driver with the kit setup will likely beat most drivers with their setup and charging and saucing tricks.
Focus on getting around the track without needing marshaled, consistency, and getting around other drivers when they make a mistake. Better use of your time and mental energy.
Instead of messing with battery charging at high amps killing your battery faster, save your money for more track fees, track days, tires, and maintenance.