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I'm assuming that the new foam is being glued to the seat base and the stock foam lays over it? Are you creating a wedge with the thickness of the new foam tapering to near zero at the back of the seat? How stiff is that foam and where are you finding it?I always add some 3/4" closed cell foam on a seat. Remove cover, glue the piece down, shape with an Xacto, staple cover back on. I usually add also another small piece near the middle of the seat to create a hump that'll lock me in place so I don't slide forward.
This sounds like something I could do.