hhmmm
Listen mate
Sounds rather as though it’s a 3 way problem, which could of course be linked to a weak trigger return spring or too much pressure on the three way. The thing is, cockers have so many influencing factors it could be any number of things (over pressurizing low pressure reg, bent 3 way shaft etc)
The best advice I could give you is to find yourself a good airsmith, preferably from a reputable company (not a mate who is good at tinkering!). Take it to them, and ask them to help you, most likely they will be happy to explain. You are obviously interested in the workings of cockers, so get someone with some knowledge to help you rather than people who do (or do not) have a clue what they're talking about over the internet. - They can't see what is wrong with your gun.
Good luck anyway
Matt (using Jamie's login!!)
p.s. - I would suggest that it has nothing to do with your air supply, shouldn’t make a ram lock up unless it is free flowing.
p.p.s try using a spell checker once in a while!