There's no "need" for true style coilovers. At the upper limits of track use, there may be advantage (theoretically). For the street, there's nothing you'll ever feel
Consider replacing your stock midlinks (the arm with the bucket for the rear spring) with the SPL mid links:
https://www.splparts.com/products/37...mid-links.html
They offer more spring height adjustment and toe adjustment, in addition to replacing some rubber bushings with metal ones
Note these require a 2.5 inner diameter spring
Also:
https://www.splparts.com/products/37...ckout-kit.html
With adjustability through all the arms, you want to lock the stock eccentric bolts in place