X-valve leak question

[LS1 WS6]

I have an Armageddon tank on my E-mag. It has an on-off that I need to screw in to increase the pressure. When I air up the gun and I'm increasing the pressure from 0 to around 600 to 700 PSI the valve has a leak on the side out of the small hole. The leak stops as soon as the pressure is over 700 or so. I have replaced all the o-rings in the valve and it still does it. I was wondering if this is normal or not.

If you screwed in a tank or tuned an on-off valve that did not adjust the pressure I don't think this would happen at all. What do you guys think?

[Tunaman]

I have seen a few valves that do that when you induce pressure into it slowly. They really need a good shot to gas up correctly. Maybe put a proconnect on and leave the tank cranked up?