the inconsistancy in a bump stop starts the first time you hit it. it starts to distort, once distorted it doesn't ever react the same way again. i atuocrossed my old car for years and went through many sets of bump stops in different configurations, none of them made for a pleasant result. the extra inch or two of travel did seem to help the suspension a bit as i only bottomed out shocks a few times and each time it was under a more extreme circumstance than what caused the contact and resulting loss of grip with the bump stops in place.
the use of bump stops as a primary control on suspension is an old idea, thus my 25 year old technology comment. modern shock design with split and variable velocity valvings are a much better route to rely upon than slamming into a piece of rubber.
a stock V6 spring set plus the adjustable shocks he already has is a perfectly reasonable solution to the needs described. if you prefer going to an extremely soft spring and skipping the suspension off the bump stops, good for you.
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