As usual, great comment and help from you sir.
I will check those snort pumps.
The bilge pump I was using (rule 500gph) worked just fine. The air induction mast on the sail to have any believable scale was about 3/16" diameter-I think insufficient air was getting into the tank and some vaccuum backup/hiccups
were taking place. I really didn't have much opportunity to observe or tweak operation as my flood vent valve mounted sideways was not sealing correctly as one might suspect..and one canceled out the other.
So, I'm putting the solenoid vent on top and hopefully snorting toward this weekends FunRun. A vent/fill valve mounted on the underside of the tank is not an option for me. This DeBoer hull is a masterpiece and stronger than my car,but mid-1990's vintage, thick-walled and heavy. Foam everywhere and a 90-ounce tank sitting entirely below the waterline is just enough to get her up and proud.