Bobby,
Grass pickerel cross with NP, and that cross might be more tolerant of warmer water. Also, the artesian flow in FL is probably on the cool side, so a pond fed by that water might handle the cross well.
you think the NP are more warm tolerant than Musky? It seems the musky range is a bit more southerly than NP. (TN and KY)
I have no Idea really how warm tolerant they are. I wonder if they might be more like SMB and can handle the temps but just need O2. I know of a lake in Lexington KY that is stocked with WE. It has aeration and they do pretty darn good.