I think you made the correct choice with the 22 for squirrels.
I have a Winchester 850 which is a rebranded Hatsan 95 and mine likes the JSB 15.89 best with the JSB 18.13 as second best by enough of a margin I shoot the 15.89's
While each gun can be different, it may be worth it to check out the JSB's.
Congrats on the new rifle. From all I have heard and from my copy, they shoot accurately.