Hi Rob,
The wind can seem inconsistant at times, partly due to the gusting effect i think and we all get caught out by it from time to time. Also whether we hit the ding or not can exaggerate the outcome. As you use the starters clubs, by upgrading you will get more consistant results.
As for the putting it takes a long time to master, or in my case, partly master lol. You have played 15 ranked rounds, you will have to play a lot more before you do improve. Obviously when the putt is downhill the putts will break more than an uphill putt, and also the speed of the greens has an effect on the break. Hundreds of thousands play this game, all have the same conditions, but have practiced the game and in time, mastered the art of putting.
It is a great game and worth putting the hard yards in.