Your average is enough to qualify you for the pro tier. its an average of the last 16 or so rounds, so the -1 in one round obviously brought your svore down, but the cumulative scores recently averaged you good enough to be in better company. Keep at it, and you will be ranked within the top 100 for pros soon.
Then when you do achieve that, and you are finally comfortable in the pro tier you will shoot a bunch of really nice low scores and you will get bumped to master :P
Play the game, practice and dont quit games and your score will always reflect where you should properly be. Think of it as the next challenge. People have made Pro within a day of signing up, its not the end of the world.