In order to make the MASTER TIER from the Tour Pro tier your average has to go down BELOW a 67 average, that is anything as high as a 66.99 average and you will achieve the MASTER TIER. Once you achieve MASTER, in your next 40 RANKED GAMES your average will fluctuate up and down and after that 40th game your average WILL NOT GO UP higher any longer, it will only go DOWN when you shoot a low score below your average. Have PATIENCE, it takes time and you will make it.
GOOD LUCK AND GOOD SHOOTING. HARRYBUNKER