Accuracy trumps everything. If your Hatsan shoots accurately, you are way ahead already, no need to sweat the velocity.My H135 has a barrel that is completely loose most of the way, and inaccurate. I need a new barrel and they are hard to get, and a gamble. Like you, I'm trying to spot a cheap parts gun that had an accurate barrel. It's a long wait.
Best bet buy another refurb in the 100 range .