I'd be happy with those on an HW100

You could spend a small fortune trying to get tighter figures, but in the real world you will not notice any difference in POI with those figures at air gun distances unless your getting into bench rest or target shooting, in which case you would have a difference type of gun.

Spend the time on pellets and practice as it will give a better return than chasing a tighter spread

PS - your still running either close to or over the limit with this

James