XRAY - Model racing cars

Ok I had my 2010 coverted running very well now the new e has has me lost I tried from Losi 45-25 n my shocks blue gray/silver springs and kit diff oil to 5/5/6rear. I run heaiver oil n the rear cause after 5min it's hard to drive pretty much everything I did to my converted nitro does not seem to work I have every Aka tire and others.. I have 5s to 4s lipo 368 to 580gram packs the only thing I noticed is it's easier to drive with a heavier pack total weight of 7.80 lbs... It turns n fine but onpoower gets loose.. I have a 41tooth up frt also.. Running teakin 1900 mmm esc running indoor clay med high bite.. I scaled it & it's very balanced within 40grams or less on all 4wheels.. 1st I will try the 43 front diff after that idk?? Anyadvice?

Where is it loose in or out of a turn, under acceleration on jumps ?

On power & jumps I want to try less up travel /droop

Reducing droop is used to help grip during a turn as it alters weight transfer.
On power grip reduce the rear anti squat this will improve rear grip a drive or running a shorter wheelbase, all give a better rear grip.