All the obvious things, silencer, scope, barrel support, barrel cleaned, magazine, pellets and breech seal all seem fine, it doesn't seem to be loosing air, or at least not a noticeable amount if any, I have filled it up tonight and marked the gauge, I will keep an eye on that, from a gun that was so accurate it's now not worth using.
I know pellets change from batch to batch, but I can't even get any reasonable results with the rwssuperdomes that it previously liked either, would love to put it down to pellets, but I don't think so.
Must be a tuner out there that knows these hw's and