Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
...Bryan has a really good routine to set the carbs on a bench and get them on track for a good start point, may have to search on here for it.
I've been mulling it over for a few days and feel that you can try to move it a little richer without having to change the jets.Nearly all carbs have got some adjustment available to take into account temp and altitude variations, they are supplied to general markets like ours sitting more or less in the middle of that range.To bring up the slow speed mixture using airscrews to adjust. If you turn them in a quarter turn it should bring that mixture toward more fuel through those low response rpm. The main jets. You can drop the circlip/raising the needle to overall bring the mixture up across the whole range from about 1/4 throttle upwards. If you try it with the idle set first to see if you get a discernable change, then you may want to add the mains to that. This should preserve the mixture parity across the whole rpm and avoid making significant steps in the fueling gradient (ie avoiding flat spots).