I agree, trigger time is the best fix. If it just won’t get better, maybe try a different trigger.
After installing a Giessele trigger my groups shrank noticeably.
They could be found on sale for under $200 a while ago. Not sure about now.
There are others that will be better than factory.
Factory AR triggers are not known for the best performance.
As far as being zeroed, it looks like it could go left an inch or two

__________________
“Look life in its iron face”