Guess Hsing-ee must be busy with other stuff, but it will still be interesting to hear what the cause of the 'problem' turns out to be.
Another thought I had was maybe the trigger weight is way too high? Well you never know, it might be a possibility.

Another thing crossed my mind, a shaggy dog story that was told to me, well I hope it was a shaggy dog story, but like lots of things there's just a possibility that it had an element of credibility in it & it's so dangerous & daft I don't feel its appropriate to repeat it in full on here but suffice it to say it was a conversation between two lads trying to work out why one shot better than the other.