I have a 20xd with 250 xb. Even with the pad, 5800 wot 17-18 psi wot. I am running a 28txp ot4. Top end is great, mid range is great. It just doesnt want to come out of the hole. I had a ring on it but I think the lu was getting to hot. The prop has four vent holes. Today I tried half plugs, full plugs and no plugs. Best hole shot was full plugs. The prop doesnt seem like it wants to catch.