Try 6 shims in the ULT, I have 7 in my mech ULE mag, 7 makes it go runaway crazy auto mode. 6 has no bounce. Check the o-rings in the on/off too, if they are really hard and crusty it might be time to change them out. Also, have you ever cleaned the valve out. I recently got a ULE mag with X-Valve and all the goodies. When i got it, it worked pretty good, it would chuff sometimes and had a slight leak. I cleaned it real good and replaced all the o-rings, now it works like a charm.
High speed chuffing
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