Automan, I have the same set up as Lineslinger.
Take the springs off and make sure none of the linkage is binding up and moves very freely.
It looks like the leverage is at a disadvantage with those strong springs on the universal linkage that ties the two carbs together.
If you don't have any binding I would put the springs on the driver side like lineslinger.
The linkage from your firewall is similar to mine.
