Matt, I took a good part of today and worked on my DLE55 trying to get it to smoothen out some. I got some results fiddling with the timing and working with the needles but IMO the counterbalance on the crank is just not cutting it. I ended up going external balance by drilling one side of my spinner backplate and then placing it opposite of the piston and rod. Made a huge difference at least by what I could see and feel. I did my runups without wings and in the beginning the airplane would slide to the right at full throttle. By the time I was finished it wasn't doing that I could feel less vibration on my calfs. While I had the cowl off I borrowed an idea of yours, I took 1" glass tape and saturated it with hi temp RTV and wrapped it around the flex portion of a K&S header followed by a wrapping of teflon tape. I had issues with leakage there. BTW. I need to get some fuel tank fittings and fuel line from you. Do you have 5/32 hose? I will need enough fittings for 2 tanks and 5' of hose. Please PM me the price and info where to send payment.