We had similar issues and went through Comp engineering shocks, Calvert's 5 ways - then 9 ways - AFCO Big gun D/A's and finally Menscer re-valved the AFCO's. Buying a good quality / rebuildable shock now, means you won't have to replace it when you step up (I really should listen to my own advice sometimes)  Photo taken By Paul Green, Santa Pod UK Sept 6th 2018
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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