You're getting good results, I would not change anything other than perhaps shooting again with the same setup when conditions are favorable. If you want to stretch it on out and see if your vertical dispersion holds, gets worse/better just for fun that's fine, you'll want to do that anyway at some point. Optical chrony's are very temperamental due to lighting conditions so I don't expect great accuracy or consistency from them unless your lighting conditions are pretty well perfect and consistent. You can frustrate the hell out of yourself wasting a whole lot of time, ammo, and money chasing minimal ES with them. Better to leave it home and just shoot if you can't get good consistent conditions.