I have noticed there is very little varience of pin positions on most courses I play.
Pin positions are limited due to the way the courses are presented - all real photographs. According to their CEO, there should be at least two sets of pins available on any full course, but they choose not to publish them any more.
Thus, now some strokeplay courses have two sets, like BPB and OAK, and some have not, PB, RSG, OLY...
Congrats to your Master promotion!
Average calculation resets with the first game in the new tier. The first score is the new average, which usually is higher due to the new course settings, notably the regular tees being further back.
Have fun - the goal for the next tier is a 63.00 average!