I agree with Steve, nothing wrong with the shocks at all. For me I always replace kit Orings regardless of kit. I've done it with AE cars, Yokomo etc. The Evo was no different, installing AE Xrings from the start and had no issues since. My current 2wd is a B5M so hence trying AE Xrings first
Pretty much any Big Bore springs will fit. I use AE again just because my previous car was AE, but I've got Yoke and Kyosho springs to try one day.
For me currently, AE Green Rear and Red fronts. I've not changed the fronts at all yet, but sometimes drop to Black Rears depending on oils.
Last weekend I did try an extreme change to 700cst Front oil and 600cst Rear, but although the car was still fantastic, will drop this down by 100cst both F&R next time as I prefer a little softer on our astro track.
As Chris and Steve have already mentioned, the car is awesome
Cheers,
Jase