Many of us have that HF buffer and they work just fine. The speed is really not a big problem. Any buffer will build heat and the part will need to be quenched at the slightest heat build up.

I have a 1700 and 3400 rpm buffers and they both deliver the same results.

Smaller wheels slow down the rpm at the wheel, Castwells Plating sells quality wheels and greasless compounds, including good tutorials.

There are many good post on buffing in the Workshop forum, as well as the library.

As said there is a learning curve in buffing razors, and even with 3 buffers and all the compounds, I still hand-sand and polish on the buffers.

There is no magic solution. I find a combination works best if you want polish and detail.