[Gaz64]

It is also worth noting that adding more progression holes adds more "airbleeds" to the idle/transition circuit.

The idea is to lengthen the transition, ideally 4 or 5 0.75mm - 0.8mm holes would offer smoother progression.

But one has to be willing to block all existing holes and start again.

There are 5 hole DCOEs, something to think about.