I certainly understand your frustration, we’ve all been there, ....this is what I’m figuring you got going on....if the the magnets you’re using are too close together, or spaced wrong, the chuff becomes erratic....chuff in signal is simple make & break ground when the reed passes by the magnet...if you’re reed switch is at any funny angle, it’ll read the magnets funny, causing this erratic chuff......that’s why Pete suggested make your own quick tester with a simple clicker switch......try using just one magnet first, get it operating correctly, and then add them to get the chuffs you desire, adjusting as you go along....another thing to check, make sure you ain’t dragging a wheel if you’re using a tender axle for your reed switch set up....pretty sure Roy uses the tender axle with his reed switches ....I’d check for a dragging wheel set....the tale tell will be scuff marks on the wheels...
Pat