I had an A-22 in 22LR and replaced the trigger spring with the "Varmint" spring from Gunshack in TX, only was $7 a few years. That got my A-22 to ca 2# pull. An alternative I went with on my B-22-FV is to 'heat' the OEM spring with a Bic, then let it cool slowly. That got me to ca 1# pull.
I didn't buy a 'Precision' A or B-22 since that gets into the $-range of 'better rifles' like a CZ. I went to a CZ-457 VMTR with the 'Match chamber' and 'Heavy Barrel, altho there are a few models that also have that Chamber/Barrel combo. If you want to stay in the lower $-range I'd suggest just the A-22 FV-SR which will get the heavy threaded barrel, then heat the T-spring. Threads about this are on inet, RFC, etc. OR look for a Used 'better rifle' on the EE .