You say sportsman tree, I'm assuming that is a full tree? If I am .020 or better, I'm happy. But, I've won a lot of rounds being .060 on the tree, -.001 red, not so many.
I think that you are on the right path though. You MUST be consistant (what ever it is, .05, .06, .09 whatever), before you can work on being better.
And just because you average a .020 or better, doesn't mean you going to win. At Bristol one weekend this season (sat & Sun), the worst light I had was a .040 (had two of them, both in time trials, and .039 in elim), had a bunch of .01X and a couple of .00X to boot. All I had to show for it Sunday on afternoon was a empty fuel jug. Also, a few years ago, I won a Super Pro race, with my best light was a.03x, and that was in the finals. I got away with a .05 & a .07, when the dragsters beside me had .07 & .09 respectively. But the car was dead on my dial in with a .004 or .002 six of the seven rounds that day. Got lucky!

Brian