Here is the page from the CFJ class website with specific dimensions for running and standing rigging: CFJ line length. It states that 30' is good but as scowlover said, you can go shorter and still be ok. We use 24' for High School sailing and have no problem with the skipper going to a wing. When the ends fray, we will keep hot knifing them till they are 22' long, then they need to be replaced. 30' is simply too much extra line in the bottom of the boat.
Sounds great I'll take all 6 of them. Can you confirm 5 or 6? I will send a payment via PayPal. I am up in LB next weekend, do you mind hanging on to them and I will come by to grab em either Sat or Sun? Whatever works for you. Thanks again!