Matt, I think we're running the same setup. I have the 125 w/ 645 servos. I bought my airframe used so it saved me some build time and since it was set up for rudder servo in the tail, I just left it there. It didn't have wheel pants which didn't matter because I fly from grass alot so I put 3.5 lite wheels on it and pants to fit them (they look more scale on it). It added a little dead weight, but not enough to matter with the 125. It balanced spot on with the battery by the fuel tank. I just switched from a 16X4W to a 17X4W. The 16 revved too high on level flight and the 17 seems to load it better. It's my favorite plane to fly. I did crank the throws down a bit from the book as they were way too high for me. Up until yesterday, I hadn't messed with the throws but I wanted to add a little rudder for a knife edge loop and a cranked the elevator up too. I will say it definitaly made it snap more, so I think I gave it too much. I backed it down a little and it's fine now.