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the shroud can make it worse if not done right and what are you running in front of it

soften RR spring

coil over load smasher at a reasonable price
http://www.ebay.com/itm/coil-over-load-rater-/122255331319?hash=item1c76fc4ff7:g:Qe4AAOSw-0xYRKSp&vxp=mtr

are you running a honeycomb in front if so get rid of it
if the shroud isn't placed perfectly it will stall air try removing it

for the best results angle the bead roller at 45 deg so the bottom roller is level with bench learned this from looking at rockets setup

#39 Tim McCreadie switching to longhorn