Hi Chris,

that you have to shorten the piano wire struts is normal. I do not exact measure the length of the wires. They are cut from 1 Meter parts and so the last one may be longer than the first wires. I leave the last wire pieces as long as they come out so it is absolutely normal that you may have to shorten the wires. May be you have got three end pieces so you have to shorten three a bit longer than the the one which has not to be cut to length.
But any way you must ajust the length at least be moving the brass tubes up / down the reach the correct AoA for the upper wing.

Peter