Here is my 2 cents, I know my stats are rubbish, but ive only been playing for 3-4 months on a kindle, but I am getting a lot better, even with the 10 credit 1 spin ball.
I have just turned level 83, but I have used both sets of rocketbladez, hated them, meter was too fast, max meter precision irons, great clubs if you can hit the ding, but a 1.5 meter and 0 meter balls means that was few and far between, Nike vapor fly level 55, not bad but medium flight meant lots of roll.
I bought the G25 level 59 irons, my 2nd hole, which was the 17th on chambers bay (was playing best of par 3) I got a hio, got to 83 rented the upgraded G25, my 5th hole, 5 on Kaiwah I got another hio, so decided to buy them and I havnt been disappointed.
Wedges, Cleveland, the 100, 80, 60 yard top of the range ones, these have shaved lots of shots off my rounds, practice flops and punch shots with them, I get to within 1 yard 90%+ with them now, especially flops from around the green. (My putting still sucks though).
Level up or average? This is the $64,000 question, but its not that hard to do both.
If you want to level up, play 18 hole unlimited WTG tournaments, 400 + your score + any bonus trophy things you get, and you get better at the course, you're levels shoot up.
If you want average down, which 9 hole are you best at, mine is St Andrews front 9 (incidentally, I only hit 2-3 iron shots in the hole 9 holes here, drive and wedge for the most part) I have shot a 29 on it, pitty it was in a full 18 hole round and I got a 38 on the back 9 :(. Anyway, play ranked rounds on a 9 of your choice, I believe the game just doubles your score to get your average, 29 front 9 = 58 full 18 = your average comes tumbling down.
Hope this helps a bit, even from a hacker around the course, driving is fine, irons ok, wedges pretty good, putting dire (but getting better).