Tuning Possible reason for flyers...what is the best fix?

I will be going out tomorrow and shoot a aground 48 and 100yards again to see the effect of what I have done so far, before I move on to polishing the barrel

I don't plan on extensive groupings, as I am starting to deplete the 33.95's I have available, and don't know when theywill be available. I did find a partial tin of 25.39 gr and have some Barracudas, but don't want to play with tune at this moment.