A few observations because I've never tried to split a print like this.
Surely R/C paper would need to be soaked for a very long time because it is specifically designed to keep water out?
For the same reason I doubt that waxing the back would have much effect, certainly not to the extent that it does with fibre paper.
Printing with the emulsion side in contact with the receiving paper achieves maximum sharpness.
The only benefit of pealing a paper would be to reduce the exposure time slightly, and I question if it would be worthwhile.