Hi Nick, the subject rifle of the thread (mine) is short stroked by 12mm. I guess to get them right its still needs the correct spring. In standard stroke I think they shoot best at about 14ftlbs.
I've shot a 95 FAC in .177 and found it very near as good as my TX200's. The 34, on the other hand, was one of the worst looking and shooting springers I've seen.