Scott mentioned that he built one of these reactors fo Energy's tank and it spiked his Alk in a couple of days and freaked everyone out. They are powerful and you really need to be careful with them. We talked about them a bit in our build thread, IIRC. Mainly about ways to tune them and set them up without risking spiking the tank parms.
As for the alita bleed off, I didn't look closely enough at your ball valve in the air line to notice that it was partly open.
Our skimmer, which I think is just about the same size as your, maybe slightly bigger due to the mixing box and other adjustments we asked Scott to include, started spitting out foam less than an hour after hooking it up (at least that was when I got back down to check on it after turngin it on finally). But I still don't feel that it is truly broken in, due to several factors (IE: bubble size consistency, truly skimmate versus some "dirty bubbles" and general flow patterns within the main body of the skimmer). Right now our biggest challenge is that the skimmer being so tall (6.5' + to the top of the collection cup) that the top of the cone is actually above the level of our "run off" drain, so we would never be able to raise the water level to the top of the cone/bottom of the twist lock (which is where most skimmers say to tune their water level to, with the air/recirc turned off, IIRC). Where do you keep your water level currently ?