OK so let me confirm I have the process right
1) Slacken idle speed fully so it is not doing anything
2) Back out the mixture screws all the same at the same setting (Honda manual would suggest 1 turn)
3) Set up each carb with a 3mm drill in the slide to give a) bench sychronisation and b) a small amount of air to allow initial start
4) Fire it up (hopefully)
5) Balance carbs and fine tune idle mixture
1) No! Tighten up the idle screw to lift the slides up until the lowest one is a nice sliding fit on whatever drill you are using as a gauge.
2) Using the screws and lock nuts on the top of the carbs adjust the other three slides to give the same sliding fit on your drill.
3) Remember to back off the idles screw or the revs will shoot sky high when you fire it up.
4) Set each mixture screw to 1 or 1 1/2 turns out from lightly bottoming.
5) Fire it up and warm it up. Ensure the Ignition is correct.
6) Set up the carbs using a vac gauge.