I hate giving specific setup advice but in this case is close enough to mine so I will.
I'd try the timing where I said above.
Crack the secondary throttles either a 1/4 or a 1/2 turn further open.
Then adjust the idle mix screws. Start with them 1 1/2 turns out. Turn in and if the engine rpm drops turn out. 1/8 turns at time. When its warmed up, try turning in again. As soon as it looses rpm, or misses, turn back out 1/4 or 3/8s. If timing has changed, reset timing. Readjust mix. Now test in gear.
Try again at different primary throttle openings (within the range of .020 to .040" on trnasfer slots. Refer to your notes so as not to exceeed this.) If it strongest with at .040 or more, then try opening the secondary throttles another 1/4 or 1/2. Repeat above as needed.
If going over 1 turn on the secondary throttles I'd consider drilling the primary throttles.
You'll then need to reduce the idle air bleeds. Stick some wire in each one. You can search for posts where I've shown that as I've got to hit the road.
