One thing that no one has mentioned, and is in my opinion, the biggest factor:
Know the holes.
Nobody is going to jump right on any of these courses on here and shoot a 27-29.
The only way to know the holes is to repeatedly play them. Learn what you've done wrong in the past and remember what you've done right.
Too much credence is given to many other parameters which are ultimately irrelevant if you aren't familiar with the hole that you're playing. Especially on BPB.
I'm relatively new to this game as well.. and I'm beginning to see how it takes quite some time to experience and retain every nook and cranny of every hole.
Of course knowing your clubs and the physics of the game are the most elemental of parameters. Yet just like practicing your read, lie, and ball striking one must also practice each hole on every course you're playing. I guess that explains why for some it takes so many rounds to score really well. My best on 9 is a pathetic 31.. and guess where? STA. lol