Ideas on running slower E.T without throttle stop

I have been using a modified Moroso throttle stop for years with great success ! it is basically a bolt that attaches to the rear carb bolt to restrict the opening of the throttle blades .. turn out to go slower .. in to go faster. Easy adjustment ! a minute or two and a 7/16 wrench. I have tried an EZ plate system as well as a Willys adjustable plate system but found that the kill to much MPH ( 2-3 ) for my combo ... I slow down from 10.80s to 11.50s for index racing

IMG_0981.jpeg