I have started flying 1/2 A control line after a few years. I have a lot of experience but I have a problem I can't seem to beat. I have an .051 that sings a fairly rich 22,000 on a 6X3 prop. It's connected to a Perfect tank level to the spraybar. I have the pickup in the tank oriented to the bottom right corner. On the ground it will run the tank empty in almost any attitude. I have a super fine needle set on it. No matter how I tune it as soon as I launch it it quits instantly. Two feet from my hand. I can have it blubbering rich, doing a perfect 2-4-2 break, or nearly peaked. As soon as I launch it it quits like someone flipped a switch. Any ideas?