I tried a narrow 3/4 height divider 1st...really made little difference
Then tried two brodix turtles end on end - no result.
Then I tried a full height divider running front to back...but this one was 1/2" wide...
This was a huge improvement.
Reasons? It improved fuel distribution to the outer ports ....but the volume of the divider reduced the plenum size substantially...and I think this helped as well.
The one area that only i proved marginally was my 60ft.....1.83 vs 1.91.......and of course now I know why this has been so hard to get on top of.......The cam profile is less than ideal.