I bought mine in March earlier this year, was tested at the rfd and was around the 11ft lb range I think. I’ve put maybe 800 pellets through it with no issues.
There’s not much clearance around the top of the barrel only 2 or 3 mm.
Interesting post, I’ve got a nemesis x pcp and been really pleased with it. Have you got a photo of it assembled with the longer barrel? What’s the performance like?