In general, most of the break-in instructions I have read (for ABC type engines) will tell you to start the engine running rich, and then lean (screw in) the high-end needle until the engine is running near its peak RPMs. Let it run for a short time (say, 30 seconds) and then richen (screw out) the needle and let the engine run cooler for a minute or so. Then repeat the near-peak-RPM run again for a slightly longer time. Keep increasing the length of time for the near-peak-RPM running until you are running through a full tank. But by all means if you have instructions for this engine try to follow them. An even better idea is to have an experienced person help you.

As for the epoxy-removal problem, that's a bit more difficult. I imagine you are talking about glueing a wing-joiner brace between the two wing halves, right? I don't know of any way to remove hardened epoxy from wood. Perhaps someone else here does? I think I would end up cutting the brace out and epoxying the wings together without it. Then cut the covering away from the wing center joint and wrap it with a couple of layers of fiberglass stuck down with more epoxy. Then you would re-cover the center with some trim covering.