[JamesCH95]

It sounds as if the bolts are directly transmitting drive-line loads. To the best of my knowledge drive-line fasteners (or any fastener for that matter) does its job best when the clamping force it provides transmits loads through the friction produced from said clamping force. Are the bolts being re-tightened after every match? Are you using a torque wrench to ensure a minimum clamping force or just "TFT" (till it feels tight)?

An FSAE car I worked on used a single lug nut in the middle of the wheel and 6 aluminum studs on the wheel hub. There was no way the aluminum studs could handle braking or engine forces on their own. We did the math and determined that our center-lock lug nuts would need to be torqued to around 110ft-lbs to give enough clamping force to transmit engine and braking torque without relying on the studs, which were there mainly for aligning the wheel. Every time before the car went out, the lugs were all re-torqued, and we never had a problem.