The 170 numbers sound about right. I suspect some of your lifters have leaked down and are making the intake valves close a lot sooner on those high compression number cylinders, and that is building up those high cranking compression numbers. So run first it as YR sez....
So after warming it up the rear 3 cylinders on each side show 155 PSI. Cylinders 1 and 2 both show 175 PSI, but have the same compression ratio as the other cylinders, so I'm not sure what's going on there.