In the searching for Drillman1 I found these and wondered how well they would work.
If I had to guess, I’d say probably poorly. The biggest challenge with getting good feeds and speeds with the existing setup is the incredible RPM of the router, compared to how fast the steppers can move the cutter. The more teeth you add, the smaller your chipload per tooth gets, and the faster you have to push your cutter to get a “correct” chipload for the cutter. A two-flute for wood seems to be about ideal, sometimes a single-flute, because even a two-flute can get hard to run fast enough. An effectively huge number of flutes like that would seem to make it even worse.
Bear in mind, though, that this is just me pontificating. I might be entirely full of hot air here.
In my experience you are exactly right @DanBrown
The lowest speed on the Dewalt is very fast so fewer flutes usually helps.