Interesting question here. This I can give you some guidance on.
Some years ago I had a supercharged A14 with an 1 3/4" SU ( drawthrough) setup.
Originally this was in a rally car that had a big 2" ( or bigger? ) Jag SU on it but this carb was worn out so was biffed.
I engaged the services of a chap to tune it and after a number of hours of needle fiddling was told that it was tuned.
I drove it and while it ran okay it really felt quite flat.
Now here is the interesting bit-for reasons that I shall not bother explaining I took it for a drive and pulled out the choke which drops the jet and enrichens the whole mixture up-WHAT a difference!!
I took it back to the chap who 'tuned' it and he simply could not believe it.
He set to and essentially removed the bottom half of the needle and problem solved!
What profile he started with I cannot tell you but I would probably start with a standard one and machine the bottom 40% off it then try the choke trick and see how you go.
Cheers
Dave