Great thread. Speed comp is a really useful feature, but I find the same dropout issue on occasion..especially if you're comping 10 tracks of vocals on a heavy project to start with :)
Sounds like many users are doing a "tweaked" version of speed comping with their own procedures.
I know I've started just taking my "promoted" clips and dropping them into a standard track ( Raw Comp I call it) and there I can fine tune fades, FX, stretches, etc without dealing with the (somewhat) finicky nature of take lanes, comp tools and speed comping. When done, I archive those take lanes. Leaves me other take options if a client wants something different, with a clear visual path on what clips I used for my actual comp. Also makes it easy to go back and find/create doubles after the fact if needed.
Again, great thread. Like hearing about how others use this feature, as it's a HUGE part of my daily workflow.