Thing is, the slack comes in from the underside, the spring side, because the foam sinks around the springs. Also, I believe the OE covers are heated into a certain shape, after they were sewn. If you look at the covers you can see the 'arch' in them.
One thing you should consider too is adding foam to the underside, and not the top where the cover lays. That way the shape doesn't change. The underlayment is key too.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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