The "under load" is where the PVCRs come in. They are the power enrichment circuit. Do not use the mains to set that. Continue to pull jet until the cruise gets happy. Then throw more fuel at it when under load with the PVCRs and give it to it sooner with an earlier opening power valve.

Do not mess with the IFRs now. If there is nothing wrong with the idle, then don't mess with them. The transition slot may need some attention after you lean out the cruise. But unless you have an issue with the idle, leave the IFRs alone. At least for now.

See how the engine likes a cruise A/F of 14-14.5. The tip-in from a lean and mean cruise to more load will be the next challenge after you get a happy cruise. But the transition slots, PVCRs, and power valve will address that.

You are clearly going in the right direction. Keep it up.