Shooting my Restored FWB 124d

I got my FWB 124 back from D. Slade last week and tried it out very briefly shooting from my carport at a target on a box about 20 yards away, It was rather chillly, breezy and light rain so not the greatest but after remounting the scope got it on paper and near the bullseye. Today weather is nice, sunny mid 60's so I set up a tripod with a shooting saddle on top, and me in a lawn chair about the same range, Did some adjustments via the scope mount then fine tuned. Shot at a box then was shooting at the pellet hole, again about 20 yards, unmeasured. I had a little vertical stringing, but 5 pellets all touching. I think at this rate if I set up my benchtop shooting tripod and a rear rabbit ear bag I can be getting tiny groups. My wife said why not keep shooting, and I said my arm is getting tired from cocking., I'm 75 always had a job that did not require much strength, so I need to redevelop some muscles for this springer.