Your observations over using high powered 23's against 34 are exactly what I have come across.
I recently refitted a home conversion done by a third party, they had fitted 1800 oz 34's on a small mill with the understanding that bigger is better.
Once changed to 750 oz in and power upgraded to 72 volts the rapids doubled.

As I said in a previous post that enclosure was a bargain but then again that's the difference between running a business and pissing about in a shed !