First of all, you are not asking too many questions so long as you are sincere about them and not just trolling. I have seen nothing to make me believe you are trolling. I do believe you have fallen into the trap of over thinking a fairly simple situation. Adding flaps to an airplane that is landing too fast is not a fix. It seems that you want flaps and have already made up your mind that you will have flaps and that is all right, but it is not the fix to your problem. Fix whatever is making the plane land too fast if it is in fact landing too fast. The guys have already covered several times the three things that will cause fast landings. Find the problem and fix it. It only takes a few minutes to change the prop. You insist that the engine idle is not a problem, so we can rule that out. It does take slightly longer to change CG, but it is relatively simple. FIX THE PROBLEM. Then add the flaps if you want them and have fun with the plane.