Yeah, used planes *always* require a thorough re-doing of the servo setup. And as far as I can tell, you and I are the only two people in the entire world to have ever mounted a wing servo correctly instead of sawing off all the mounting tabs and gluing them in. For removing horns in-place, I've had good luck trimming the little lip off the servo arm with a knife so that I can grab the screw with pliers, then I just grind 4 flats on the screw head so that it's easier next time. Anyway, now that your servos are fixed you should be able to get rid of those crazy bulging covers.
That's a great looking color scheme and the plane looks brand new! I have the plain white/red "Ceres" scheme and always wished I had something with a little more pizazz! Mine's the F version with heavy wings for an AUW of 85oz, it sure would be nice to take 10oz out of the wings!