Hi Heather, do you still develop the prints? If yes, for how much time in average? If the highlights clear in 20-30 minutes that's perfectly OK in my book...

Good luck, I'm sure you'll find a method that suits your needs,
Regards,
Loris.

P.S. The PVA glue that I use doesn't make the paper buckle, maybe you're using too much? It's quite hard to make 300gsm/140lb paper buckle...