There are many posts here of folks like you that like to get to the bottom of a trigger issue, while mixing & matching parts. I rarely hear of a satisfactory conclusion & see folks doing things that impact the safe use of the firearm.
There are several nice triggers that seem to work well in the 15-22... plus some that don't. I know from experience in trying a Timney that gave me all sorts of issues. I use CMC in my AR & 15-22 & it is perfect... thus that recommendation. As I said, lots of folks on this board use that trigger & I can't recall a single complaint. If you try another brand, fine, but just research it first. The 15-22 is not an AR & triggers that work great in an AR don't always work here.
For me, safety comes first. I have seen discussions where people do all sorts of things to make their trigger combo work... and many of them scare the poop out of me. That is why I like drop in units.
As opposed to getting rid of the gun I simply suggest getting a better trigger. Several really nice ones out there that work great in the 15-22.