Here is an update on what happened with the lifters from the start of this thread.

We never really got an answer as to why the bushings failed so quickly.
But, they did replace them with a different version that does have an oil band and edm feed hole from the band to the axles.
They also have the upgraded “speedway” bushings.

I had the customer prime the motor with the valley cover open, and he verified oil would ooze out around the wheels with the system under pressure.

No problems with these so far.

I sent back the cam and had it checked for hardness, it was fine, so I had them regrind it.