Thanks for the reply, guys.
Here's what I have:
1987 750; 1mm over; 1990 (L model) intake cam; Yosh Duplex; Mikuni RS 36 flatslides
Carb specs-
125 mains
P-4 needle jets
Jet Needles - whatever was stock from Mikuni
15 pilots
Pilot Screws - 1/8, 1/4, 1/2, 1 turn out all present issues below; 1/4 & 1/8 turns work better than 1/2 or 1
The tip of my Duplex is sooty and up to 1/4 throttle it sounds fat, blubbery, stumbles.
However, it takes a while to get it warmed up to where it won't die coming off of idle. Once it does come off of idle, it won't hang nor dip below idle when I blip the throttle.
But it does sound fat at low throttle setting as one might use cruising through neighborhoods keeping a low profile.
Also, I pulled a plug to see what's going on plugwise. If I hadn't ridden the bike and someone showed me the plug, I'd tell them it was spot on. No soot, nor any white deposits or other lean indicators. actually very clean. This was after riding for about 5 miles at low throttle settings through town.
Above 1/4 throttle it is as clean as it can be. Pulls smooth to redline - no hesitation, no stumbles.
These have always been problematic at low end since I bought them 21 years ago. I fiddled with them, had very accomplished tuners fiddle with them, and back when they were on my LTD I paid a guy to spend a day on the dyno with it.
It has always been a choice between crappy bottom end running or crappy everywhere else regardless of who tunes it.
I can't imagine I have a reversion problem due to the larger intake cam; it's not THAT radical. I even used these carbs on a 90 motor and they gave me the same fits, so I don't suspect it's a head/cam issue/low port speed/reversion, etc.
I've looked over the Mikuni manual - it looks a lot like the one that came with the carbs except the old had a picture of Schwantz ripping a wheelie on the cover.
I did look at the thread you linked, Slabby1100, and all I can say is that the dudes who have seamless carburetion on their RSs should buy lottery tickets...or mine have been hosed from the get-go.
Also, my pilot screws are fine, everything is perfectly clean, etc. These have been a problem since the day I bought em.