I have heard a couple of restoration pro's say that if the rubber molding is worked into place inch by inch, rather than simply slid into the track, it will lie flat against the scuttle. I have tried to do that with no luck. Perhaps you can get Tom Kovacs to share his secret or source with us?
I can't envision that a flat piece of rubber, as is supplied by the usual suspects, could conform to the curve of the sheet metal without creating a bulge/buckle unless it is in fact molded with a radius at either end.
BTW I have seen BMC sales literature showing the usual bulges--perhaps they are required for Concours?