if both rotors are even on compression( even low comp) it will still run and drive but lack power and eat gas. its when you have an uneven balance of comp when you start getting hard starting an not stay running. My last motor had 60psi on all six face for 3000 miles before it finally blew for other reasons. started everyday and had good solid power.
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if you havent been in a small plane its worst, cause your eyes and brain say we are moving and your body says oh no we are not. eyes and brain go asshole we are moving, cant you see? body says fuck you we are not moving at all. so they fight and fight and eventualy your body says, you know what fuck you brain, see if you can stop this!! then you throw up.