Problem is your cutoff lever. It is being held in the wrong position due to the enlarged shape of the Siegetek cutoff cam, your trigger sled slips over the contacts and releases instead of going into the contacts.
Solution is to use a different cutoff lever, or mod the one you already have to work.
M120 isn't THAT bad. I got around 350 with an unspacered M160 just from a good air seal.
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