Those are some interesting numbers. I wonder if a reduced power small spring might work out...hmmm. Can we talk you into going back to lab and coming up with some small spring weights?? You may have to start charging a consultant fee, lol
I just returned from a few days of deer hunting with the Henry and wish I could report slaying some big beast but...didn't see anything I wanted to shoot. IMO Henry got everything right with the H0-15, EXCEPT the hammer and trigger pull. It's a sweet handling little rifle for walking through the brush or sitting in a 16 ft. ladder stand. For me it's also a natural pointing gun for offhand shooting. Even with a pound more than my preferred 3 1/2 to 4lb. hunting trigger it's easy to smack clay pigeons in a dirt berm at 50-60 yards....not bad for a shaky old buzzard.