Nathan, never tried the short shock bodies / tower but always run the wider rear.
I run the 54mm shock shafts and always have done and never use anything other than the middle hole on the wishbone for offroad (outside hole indoors if the carpet is supper grippy). I have found that the droop balance is never quite right when running the 50mm shafts (kit) and even with the shock eyelet unscrewed a lot (to the point it's only just hanging on there) was never happy with the droop on the rear.
Probably ok if you only ever run the inside hole on the wishbones but I always found that the car was way too soft even on the stiffest springs in the inner hole!
As an aside you might be interested to know that by calculation moving in / out one hole on either front or rear wishbones is worth just about 2 full spring grades (e.g. if you run a bright yellow #65 spring then move the shocks in one hole you would need to change to a light green #75 spring to achive a similar wheel rate).
As I have always said I find the RB5 responds much better to being run a little stiffer than most other cars ..... probably due to how solid the chassis is.
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