I agree with the above.

It may help to think of the IFR as the idle main jet. It meters the fuel on the idle circuit. Larger orifice = more fuel, smaller = less.

And think of the IAB as idle jets for the air. This time a larger orifice opening means more air in relation to the fuel, aka leaner, while a smaller orifice results in less air and a richer idle mixture.

You may use a little caution when messing with the air bleeds because they also affect when the main fuel circuit activates.

Do you have a wide-band O2? They help a lot not just to let you know mixture, but when each circuit comes and goes and what effect your changes have on each.

If you have any off-idle issues, don't forget about the transition slots.

If you already know all this, my apologies. I just hope to make you aware that idle and off-idle tuning is the most complicated because there are several circuits overlapping.