Glad I’m not the only one who hd to fight the Roden Camel (though in my case I was responsible for some of the battles). I too found that the upper wing wanted to wiggle a lot: the struts are thin and a bit flexible. With such cases I find that structural bracing wires (i.e. mounted in the wings, not flexible like EZ-line) helps considerably. Stretching wires symmetrically (one left, then the corresponding on the right etc) makes it easier not to cause warping on the process.