What ammo are you shooting?
I will clean my barrel after every Match or Range trip. I swapped lots of ammo so I had to re tune. New tune setting is at almost 7 on my EC. I shoot 2 round groups after a 10 round Controll group at 50 yards to see what is the best number. Then ill rotate about .25 of a line change to see what it does between 2 numbers that were good.
When that number is decided I shoot that at 100 to verify said number is still good. Then micro adjust it at 200 yards per Di Precision instructions. I will spend 200-300 rounds doing this.
The tune will stay where it is until the lot of ammo changes. If I totally scrub my barrel down it will take 3-4 fowling shots to be back to where it was. If all I do is soak the chamber and dry path it until clean it is typically first round where it needs to be. Traveling and elevation changes will change the zero a little, but my tune has not changed.
To say everything I did I don't think you have a tune issue I think it is in your ammo. It could be a MINOR tune adjust.