.. i see several fixes suggested by different people. And indeed, many of them will change grip and grip balance, as there are different ways to skin a cat

.
But suggest to be careful and not do whole lot of suggestions at same time. It's hard to evaluate impact of change if you have done several of those simultaneously.
Imho worth to make some plan of doing changes and testing out impact.
- I'd probably prioritize getting alignment right. And not just because of grip balance, but also to get more out of tires (nobody against spending less on wearables, right?

), as probably after two track days wear lack of camber in way of ripped outer sides will be obvious. If you go all the way for finding out the ideal alignment for specific track and specific tires, worth considering purchase of pirometer.
- try things that don't require mods at all. For example PD. Or changing tire pressures front vs rear for shifting grip balance. Adjusting driver inputs.
- dial safe baseline damping settings on coilovers. Zdan provided helpful hints how (clicks from full stiff). For initial settings, if nothing else, suggested on forums or in product manual, should do.
- try adjusting damping & rebound on coilovers, increasing & decreasing / try different swaybars / different springs / changing rake. Preferably one change at a time to single out impact of change and hopefully your driving is consistent enough for own mistakes to not affect results instead of changes in suspension.
My wild guess, that better alignment should fix most outstanding handling issues.
@
ZDan: but usually all tires in set would have overall drop in grip then, if they had been the culprit, and it wouldn't change grip balance front/rear, just lower overall grip level. As for spring rates .. recalling questions to RCE about why some coilovers have different front/rear springrates, some square and so on .. IIRC response was that can be several ways to reach result that works. Valving of shocks also plays role, and so are bumpstops part of picture, and while motion ratio indeed is different, but imho it's far from something as simple "get square wheel spring rate taking into acount motion ratio", and not as if everything that's not is wrong. Too many possible variables. For example, how about wheel frequency some suspension vendors mention? Available travel? Installed downforce mods? Alignment? Other non springs/dampers mods like swaybars?