My club has two divisions the first for HC of 15 or less and the second for 16-28. I think this is used for all competitions at the course and works well as the lower handicappers don't have to worry about bandits while those of us with a high HC have something extra to aim for which is moving...
The White tees at our club are reserved for players with a handicap of 24 or less as well as for all competitions. The reasoning is to keep things moving on the course with the highest handicap players using the shorter tees. There is over 500 yards difference between the yellow and whites so...
If you added the grip from the 4" you cut off to the shaft below the grip that remained on it then you should be fine as the entire length of the grip needs to be at least 7" long. The bit you may have a problem with is that the grip would have originaly tapered in one direction where now you...