Found this the other day on JMac's Blog -
http://www.jmacskis.com
It made interesting reading..
Which zero off letter and number is best for you? Lots of people don't understand the letters and numbers very well, so picking the right one can be tough. I knew very little about them until last fall, and I have developed a bit of a theory for choosing a letter/number combo. It's a general way to pick a letter because in reality whatever letter you pick you will most likely adapt to the pull type over time.
Here's my thoughts on Letter choice:
A is a slow speed/long line letter, 32mph or slower. A is on you the latest and the longest, and at those speeds the boat being on you longer is good because you pull longer to carry speed out to the buoy and the zero off will be helping with that.
B is a 34mph letter. B is on you sooner than A and releases you sooner as well. At 34mph you need to pull slightly longer than 36, which works well in the B rhythm.
C is a 36mph letter. C will pick you up fastest and come off you fastest. The early pick up and the quick release is ideal for the rhythm of a 36mph slalom course, especially at short line. The shorter and faster you go, the less you can pull after the wake, so having the boat release you early frees you up off the wake to let you move without the boat adding late whip/speed.
(keep in mind, Zero Off does NOT anticipate your pull, the letters react when you apply pressure which slows the boat)
1, 2, 3 will be adjusted as follows:
1 for small kids that any boat is strong or for teens and adults on a strong boat, basically if you don't pull hard 1 gives you a bit of an edge in the tug of war with the boat.
2 is for a small adjustment if the boat feels too weak at 1
3 is for a boat you know is too weak, it gives the boat its full power to keep the timing of the letter and the speed of the boat perfect.
Something I like to do is keep 3 for when you need it. If you're a big guy who pulls hard C 3 might feel best even behind a strong 6.2L Nautique 200, but if you go to a tournament on the weekend and they are pulling 5.3L 200's it'll feel softer and you have no way to adjust it. But if you train on C 1 and you go to a tournament with a weaker boat you have the ability to add power by going C 3. That's what makes sense to me and is how I do it, try it out, and hopefully it helps you in the future!
Might give it a try - although i have been a longterm user of A2...and i am a 36mph skier...but that could be a throwback to trying to make the boat feel like they did back in perfect pass days....