What brand retracts are you using? I see you are using Robart struts but can't find any where that you mention whose retracts they are. I built one of these years ago with Dave Platt retracts and had nothing trouble with them. He may have improved them over the years but just wanted to give you a word of caution. The plane flies like it is on rails, you couldn't ask for a better flying war bird. With the wide stance gear it is good on the ground too.