I have often noticed that some trem Ibanez stay in tune better with 009 than with 010s.
Some stay in tune better with 010s than 009’s.
I have never found an explanation or fix for it.
It must be an act of the guitar god (Holdsworth, I’m gone get you

) that is beyond us humans.
The difference is so small that I can’t even for sure say that it’s actually there and not my imagination. Meaning, you have a guitar and it is the way it is, you change something and gets worried about if it was good or bad. You start to look at things in a new way an notice things you didn’t notice before, but that has been there all the time.
No trems stay in tune perfect.
/Magnus