Seve,
It varies from person to person obviously. I had more trouble dealing with the green speeds when i made Legend. The longer tees not so much. I was using a L79 TM SLDR in white, and either a WGT G13-S or a Cally L33 ball. The SLDR is very similar to the Nike you are using now.
While I have a better driver now, from time to time i will still use those balls, as I am trying to get back to using a 2.5 meter ball, like the Cally.
There are better balls, without breaking the bank. I had someone mention the Cally L45/Legend+ balls to me. I found they play about as well as a Nike L61, except for the difference in meter speed. They are 300 credits. I knew a player who used the WGT Legend G12-SD2 balls and was very competitive in our CC. They are 155 credits.
Good Luck and have fun. Learn, but enjoy the game.
phred952