The lap joint is what is leaking in a few places. I got the pan cleaned up last night and stuck an old fan blowing downwards right in the center to dry the table. I can see a couple of spots in the weld where I think the leaks are coming from. I'm just going to burn a hotter bead around the entire lap joint in the hopes it will seal up. It can be tough to pinpoint because I have 2.5" of overlap on my sheet and angle iron, and the water can seep under the sheet and run down the angle a bit until it drips. I'm certainly out of practice on welding since I have not been fabricating much over the last five years. I'll get it fixed though.
The PVC ball valves are just a pain to turn, that's why they are junk. I don't have to replace them right away, but I probably will replace them after my testing is completed.