Tuning How is my group?

I only have about 15 yards to work with, indoor range so no wind. .5” group, full mag of 16 at 910 fps with .25 HN Crow Magnums.

Velocity varied from 906-912 with one pellet at 920 because I shot before the reg caught up. All of my pesting is less than 30 yards. Should I keep working or does that look good?

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I didn't see what gun you have. You're on the right tract getting away from the flying bricks aka Crow Magnums. Work on your breathing and your squeezing, get the gun sorted out, it takes time and practice.