Electronic waterinjection may help with the bottom end. This was needed with the type 4 pipes. Speedworx was the only Dry Pipe that made good bottom as well. I noticed you said you added a sprayer, assuming just dumping water in, but no way to cut it off?
Trying to run it like a tnt/rrp pipe with the sprayer. Does the rrp sprayer cut off at some point?
Sprayer I am running with the spray facing into the chamber. Tapped with a low jet to control flow and running a filter pre-sprayer.