I would agree, I installed a set on my rally car and was getting terrible valve float at 7500rpm with good Jeff Taylor valve springs went back to standard rockers and it revs back to 8100rpm no problems.

not only are the rockers 20% heaver than standard allot of the extra weight is on the tip (roller) which increases the momentum.

I think I will just keep my set for the trophy shelf as they do look good.