I have Vegas 04's. On most of my struts, the valves have torn internally. Now, everytime I go to pump up my kites, it takes multiple tries to keep any kind of pressure in there before I can insert the plug. As anyone else had problems like this? Any solutions? I'd consider buying replacement bladders, but don't know if any of the aftermarket replacement bladders have one way valves.

You need to be very, very careful..you are in a dangerous position with those one way valve's leaking.. You should stop flying those right away, and get all new kites! Probably a new board and harness too!

Seriously, the one way valves stop working after time..just like the stupid balls that go in some bladders. You just need to pinch them off, and not rely on the valves... The replacement bladders made by Airtime, don't come with any valves, balls, etc..