Splitting Large Projects Revisited

Once again I find myself needing to split a continuously recorded project into multiple projects. I imported a bunch (83) of PT aif files into one large project. The PT recording was done at 48K/32 bit (correct me if I'm wrong on that bit rate - It's what Sonar is displaying), and the total file size is well over 70GB. Maybe it's just me, but when working with projects of that size, my system gets kind of chuggy. I had to set latency and disk buffers quite high just to avoid dropout, and when I hit the space bar it takes a good ten seconds to go into play mode. Any way, my method is to get an overall rough mix and project layout (busses, EFX, etc) while the project is in one piece, then split it up, preserving all of the project particulars into new, smaller projects. This particular concert had numerous musical acts and styles, and in some cases only a few tracks were actually used, like in the a capella ten voice set, where only ten tracks are needed. Just another reason to break the project up. My method of doing this (from time immemorial), is to set split points at either end of each song, delete the material before and after the song, remove any unused tracks, Select all, Bounce To Clips, and finally save what's there to a new project. I found that if I do not do the Bounce To Clips, no amount of "Apply Trimming" has any effect on the files that are saved with the new project, i.e. they are always the full length wav file. I am using X1 Expanded, and have downloaded X2 do I still have to go through all this nonsense to split up a big project? Thanks