I made Tour Pro myself not too long ago. Right now I have a 75.29 average, but I'm actually glad it is so high. I've seen a few threads on the forum about how difficult playing from the Master tees has been for some players. This game is already difficult enough for me from the Tour Pro tees, not to mention the change from Fast to Very Fast greens hasn't exactly been favorable for me.
It may not be the smartest or most prudent choice, but I've decided to hold out until level 79 before I upgrade my irons. From what I've read the G20s are a great set and I'm sure they will help lower your scores, but I've read that the Rocketbladez are second only to the level 90 r11's. With limited credits available to me, I don't feel I can justify buying the G20s since I'm not going to keep them long term. By the time I hit level 79, I hope to have the Rocketbladez irons, a junior Versa putter, and 3x high trajectory wedges to go along with my Taylor Made driver and fairway metal. Then, and only then, will I feel comfortable trying to tier up to Master.
Good Luck with your journey.
-Inigo