The .22 should get to 11+ with 4 pumps and the pressure relief valve blow off during the 5th stroke. The .177's usually took 6 strokes to get to 11+ and blew off on the 7th.
If a .22 is only making 8FtLb on 4 pumps it suggests the pump is wrongly set up or there are seals leaking. I would suggest a full strip and replace all seals.