Of course you threw 300! You throw the ball absolutely great.
I don't know how that style works on sport shots and tough patterns but yours is one of the best one handed thumb in ball styles I have seen for bowling on a top hat.
Of course there are 2 handed styles that may be better on league shots, but not much!
Great style, I would love to have about 3 or 4 elements in my own game.
This is what I am striving for!
REgards,
Luckylefty