I have a 1985 Honda VF500F I’ve been restoring. I have the entire bike together and it rides great for 15 minutes. After that it wants to stall at idle, and then anything under 4,000 rpm if I can keep it going. I have put a lot of work into solving this issue, here is what I have ruled out:

Entire Ignition system: Plugs, Wires, Coils, CDI Boxes, Pulse Generator, Battery, Connections, Voltage Regulator

Entire Fuel Delivery System: Fuel Tank, Petcock, Tubes, Filter, Carburetor (very clean), Vapor Lock

There are no vacuum leaks, and the filter is in good shape.

During the investigation I discovered that a hose connecting the head near cylinder 4 to the air boost was cracked, and have repaired it. The idle has been adjusted repeatedly without success, along with the air/fuel mixture screws (4). It may be worth noting that the carbs are not perfectly synced, as the 3 adjustable carbs cannot be adjusted enough to match the one unadjustable carb, but they are very close. The bike is will not start without throttle blipping.

I really appreciate the consideration and time spent answering this question, thanks.
The bike is completely stock, with no modifications of any kind.