[RJ Sledge]

What’s your BC measurement on the hub and what is it on the wheel.
Early Ford Mustang Fairlane maverick pinto was 4x4.5” and later fairmont models were 4x108mm (around 4x 4.25”).
Make sure you are using the correct BC on wheel and hub.
Studs have fatigue from a register that’s too loose and allowing it to flex.

The pics of your hub stud hole look rough, was it an original Aero Space hub or modified for a different BC?
Not knocking your equipment.....just imo lol.

Good luck

RJ