I put pumpkinseeds in and they went absolutely insane in 2 years, but before you add bass just make sure you have lots of bluegill - that they did in fact reproduce, if not the bass will clean them up and run out of forage in short order. You can add trout, just add 1.5 to 2 pounders when you do it and they will fend for themselves until your LMB gape size accomadates them, and if you like the trout then just cull the large bass out when you can or add larger trout.
The trout will eat smaller bluegill, if you add brookies they get a pretty decent gape and can take some bigger bluegill. Most likely the trout will survive being that deep and spring fed, my lake is 6 acres with a few areas of refuge 13 feet deep and the rainbows and brookies make it all year round here in ontario...im very surprised actually as last summer the whole lake was like bath water - but they made it.
good luck!
