i second a rear sway bar. if you want to dial out understeer, then u need to increase rear stiffness. forget matching sway bars. On my autocross car i still have the stock front sway bar, but a huge rear bar (+6mm diameter over stock).
my next choice would be firmer shocks. or a match spring/shock kit.
sway bar endlinks and bushing will have no noticable effect. and likely the same for strut bars and subframe connectors. Those things I would do last (cost benefit ratio is low)
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