After further testing, indeed, no issue with FF vs fuel consumption, just an issue due to units misunderstanding. It all comes down to a "human/machine interface". I'd bet a lot that the one who decided to display that FF in (lbs/hr)/100 instead of lbs/min never put his pants in a real plane. Or at least not at 150ft/540kts...
Anyways, thanks for the various replies and inputs, some good came out of this!
