So I agree with Charniga, high relative intensity pulls lack the speed and form specificity for weightlifting and should not be used. But I also agree with Chris that pulls can be used at 80% intensity since this intensity should provide the overload, speed and form specificity desired to improve a lifter's max.
I know it was mentioned that 80% was the best for producing optimal power, but remember this is an average based on a study.
But here is the meat of the question. My thinking on pulls was this: even though there is a loss in speed in the pull, wouldn’t there be a carry over to weightlifting because one should be able to pull more weight than with the oly lifts? Thus increasing this would make the pull phase feel easier since the oly lift will be at a lower percentage of the actual lift. This would allow the lifter to then accelerate the weight more in the pull to get more momentum on it, thus giving him more time to get under the bar and catch it.This is based on the force/velocity relationship, which tells us that we can move lighter intensities faster than heavier intensities. Thus by making the lifter stronger in the pull they should have the ability to pull the weight with more power.