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You seem to be hypothesizing that spark energy can, in some way, influence ignition timing? I don't think so. If you set your magneto at 28 deg BTDC that's what you get from kick start speed all the way to redline. Your big spark won't start the engine if it occurs too early, and the (kickstarted) engine isn't turning fast enough; and that's down to technique, a bit of luck and a whole bunch of other variables. All things being equal retarded timing is always going to make kick-back less likely.
You seem to be hypothesizing that spark energy can, in some way, influence ignition timing? I don't think so. If you set your magneto at 28 deg BTDC that's what you get from kick start speed all the way to redline.
Your big spark won't start the engine if it occurs too early, and the (kickstarted) engine isn't turning fast enough; and that's down to technique, a bit of luck and a whole bunch of other variables. All things being equal retarded timing is always going to make kick-back less likely.