I don't believe the ACR is the issue. Once the engine is running the ACR is taken out of the picture because of centrifigul force on the spring and weights. As Roland stated I would try closing up the point gap to.018 or less. If the engine has a lot of mileage on it the point push rod could have significant wear on it or the lobe on the cam could have a groove worn it which will throw the timing off quite a bit. 
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1641, 1541, 682 with 18hp command engine and hydraulics from a 782. 1872 with a power angle blade.
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