Welcome to EP Steve. I just sold my ITS and bought another EP RX7. I had an EP a few years ago and have some suggestions for what it is worth
You are moving from radials to slicks. The suspension has some radical camber changes that slicks do not like. Unless you want to spend a fortune on tires and go slower than a S car you need to deal with it. Set the chassis on jack stands and remove the springs from the shocks and bump steer the front and rear. Now check the camber as you move the suspension. Resist the urge to drop the car to the ground without seeing what it does. Slicks want to be flat--not cambered.
Do not add tubes that look cool and do nothing for stiffness. Plan the minimum.
Anything above your waist contributes to a high roll center. Mount low and if you can't, redesign until you can.
Have fun!!
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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