2 questions. Would it be worth it to add a sedra9000 as a recirc only? I have tried the gate valve mod per asmskimmers.com and can`t get it to make good skimmate? Seems like it wants to make the skimmer surg up and down.Also the bubbles in the neck don`t want to move up? They are all the same size? With the riser tube they come into the neck very fine and work up from there. .Thanks Panhead.