I have modified the halyard system on the I-20 and now find it works great! I went to a smaller dia. line (3mm kevlar) and the aussie ring. Along with that, I have Mclubed the heck out of the luff rope and slot. Even in big wind and water, I have been able to drop the main, still, though I forget to rotate the mast enough for a clean drop...once I remebered to do that....I really sides down fast!

Lots of McLube...smaller dia line....aussie ring...seems to work