I had a Tempest in 0.22, but just could not shoot it straight, it always seemed to be torqueing to the right, but I knew someone with a Turkish 0.177 model who said he had no problem.
For a brief time I had a 1950's Senior with a slant grip in 0.22 - could not shoot that for toffee either, but now I have a 1966 Premier in 0.177 and it shoots perfectly straight.
I did have a theory that there is something going on with the longer lock-time for the 0.22 models, but I have recently acquired a Hurricane in 0.22, and this shoots straight. Does that extra mass at the back end make a difference?
The Senior trigger was very heavy, which is never good for holding a pistol on target, the Premier and Hurricane both have lovely triggers, but then so did the Tempest!
When I work it out, I will let you know...
Too many guns, or not enough time?