Timing help needed

can't think of anything really weird. First times I changed IABs I was surprised that they also affected the fuel mixture at dead idle. I had thought they 'only' affected the top of the transition before the mains started up. But now I understand that IAB affects the fuel density in the idle down well - so pretty much everything that feeds from it.
Going too large will result in a low speed dead spot.
First time was the worst that I can remember and we hadn't even made any changes to the IAB.
All we did was drill a couple holes in the throttle plates so they could be closed down a little to get a lower idle rpm.
But that was enough change in the relationships that the car wouldn't go up a 30 mph hill without feathering the throttle. I knew there was no way I'd make it back to my place.
We found some wire and stuck it in the IABs until the low speed power came back up. At the time I didnt really understand what we had done, but my coworker who was helping me did.
So thats the one 'too lean' in the IABs experience that sticks out in my memory.