well i've set the pressure on my adjustable tank at 600psi and it still fires fine...
although it may still be part of your problem...id rule out it being your entire problem
did you try swapping in the extra orings that came with the ult..
it could be an o-ring tolerance issue...
and btw how many times have you cycled it?
sometimes things just need to be broken in
my ult was a little inconsistant at first...
but after going through about 3 tanks of air it seems fine
remember to make sure the entire valve is well lubricated(not just the on/off)
put 3 drops into the asa then put the tank back on and cycle the gun...
i cant think of anything else to try
like i said before try borrowing an adjustable tank from someone
you wouldnt happen to be using MICRO-line would you?
TheDuelist "The problem is that Tom has developed the VW Beetle of the paintball industry. It's almost too good to change and far too reliable."