Hi Chris, I have the Dellortos on the Lotus. Assuming all the jets are clean and the float valve has the correct clearance to the cover ( with the gasket fitted ) and the float valves themselves are good, I use a Gunson's carb; balancer to initially set the throttles ( I do like the clever differential linkage ) then I Colourtune pots 1 and 4; then reset the "suck" at the trumpets.
That seems to work well for me.
Dellorto used to do a very useful booklet on dismantling, re-assembly and setting up . I can't see it listed on their web-site any longer though. The two manuals they still do are about 2/3 the way down on the home page.
I'll have another look for it later.