OOPS - The original results from the SFPF calculator for straight router bits did not consider that it’s the cutter shaft material that determines the cutter deflection. Cutters that are carbide tipped (like the Amana) or use carbide inserts cutters likely have steel shanks - so they aren’t as stiff and deflect more. I’ve corrected this for the Amana bit as shown here.
Yonico makes a bottom cutting/clearing carbide tipped 3/4" diameter 1/4" shank router bit that should be able to plunge (I plan to try that). Since it’s only rated for 24,000 RPM, the 27,000RPM Dewalt trim router should provide more power than the 30,000 RPM Makita. Here’s what the SFPF calculator predicts for that.
@WillAdams I’d like to update the closed SFPF calculator thread to reflect this correction and other minor changes if you think it’s worthwhile.