When I did mine I had to fine tune the primary idle air bleeds further.
(My donor carb was a 700DP).. Needed a slightly smaller primary idle air bleed to get it just right.
Soldered up the 75 and redrileed with a .062" 1/16" drill bit. Then hand honed it to the size needed with the drill bit until it was dead nuts. It is about .064" +/-. The AFR gauge allows you to really dial in the idle circuit.
It was balky off idle. Off idle lean spot ....Now it is very sharp and smooth.
Depends a lot on which metering blocks (donor carb) you use.
the idle air bleeds in the stock donor carb body are your clue. Have a look.