Another thing, if you haven't yet, most people move everything they can into the sump. Heaters, skimmer (done), temp probes, etc...
I say Temp probe because with the turnover that you have now going through the sump, I seriously doubt if the temp will ever be different unless the electric goes out.
OH YEAH! There is a good test to do. Unplug everything in the sump, including the return pump. Did you leave enough room for the water to drain down? If it looks like it's going to overflow, just plug the pump back in. Then drain some water out of your system. It's best to try this while you are watching it because you can plug the pump back in and prevent a flood. If the electric goes out, you don't have that option.