Building a new z drag kit for my round boat and was looking for some input on prussik sizing. So far I have 150' of 11 mm static petzl rope, a couple of 35 kn rated pulleys and quality biners. An 8'x 1"crane strap for an anchor. Even threw in a nice figure eight and a crib sheet to live in the bag. Wondering how much smaller to size the prussik loops. Any input would be appreciated. Thanks!