Do you really think 70% is acceptable? Sailing is not a contact sport(OK college sailing may be, but not for the rest of us). To me the only acceptable time to cross is if you know you can make it. The risk is not to your boat but the boat you are crossing. Personnaly I would like to see the rules changed to an auto DSQ(without the option to use it as a throwout) if there is contact and you are at fault. If damage to the other boat a possible regatta DSQ. Lets get back to sailing skills not sailing risks.