Hey there:
Keep up the posting for all of us. I shoot many different air guns, myself. I think your shooting is very good. Plenty good for snakes, head shots on squirrels, etc. I am in the country and shoot almost every day, air guns and other guns. I will/can tell you this; air guns will surely make you a better shot with all your other guns.
I am fortunate enough to have a great place to shoot here at home. I have some guns that will put them all in one hole. I don't measure my groups, but I save the targets as "trophys" with all the info on them; date, temp, weather condition, gun, pellet, etc. Keeps a good record in my notebooks.
Keep up the great shooting and posts.
casper_zip