I find it fascinating, really see what may have motivated Paul to master it.

Typically I'll use 70% at 10mm/s. Air assist with about 10 LPM to keep the soot from the lens.
Glass plate under the veneer to reduce bottom side burning. My glass is fluted so the smoke can escape but I'd imagine a screen or bed of nails type base would work as well.

Some softer woods can use a lot less power (50% or less) and harder/thicker stuff needs more (75%). The Zircote and Macassar ebony are tough!