I heard that when the 5.0 motors from ford when they were new, were only 155psi on the cylinders. I did mine last year and they were all at 150psi. 153Kmiles on the block.
The oil loss could come from 5 different places:
1. Piston rings are shot
2. Sucking it from the valley from the lower intake gaskets not sealed.
3. valve seals are shot
4. Its leaking out of the motor, especially more when you drive.
5. Sucking oil from the PVC valve, or breather tube going to TB.
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