I just thought I'd mention it as it seems like a reg/asa problem as opposed to the bottle itself and I think that all of the regs on Stakos are aftermarket. And depending where/who you bought it from it could come with one of a few.
I've seen them ship with the maxflo mini, a polish company that sold them at Millenium events last year shipped them with Centerflag 420 regs, yet planet site sells them with a Pro Toyz reg. Also, if you bought it 2nd hand off the forum it could have a completely different reg yet again.
Just thought a bit of clarification might help you solve the problem quicker mate