I only watched the last vid but it sounded like it was even surging over 3k rpm? I had a 362/65/12cm yrs ago that acted just like that. I used the same charger as a secondary in compounds and it worked decent. Man about all you can do is go to a bigger ex housing if in deed it kept surging in the upper rpm's, which I'm sure you know is gonna make it more lazy to spool.
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