LMB will likely over predate YP (and RES). My choice would be SMB, however that depends on your location. (The "Bluffton" location link goes to South Carolina, and I am completely ignorant as to SMB prospects that far South. Someone here should know much better than me. And your pond's particulars - elevation? spring fed? - will have impacts.)
Delaying predator stocking has merit; exact timing will depend on the stocked sizes of your forage and predators.
There are posts here (somewhere) on hybrid Crappie. IIRC they are capable of reproducing.