Crankcase Pressure

It's because the blowers stopped producing positive pressure and the turbo's aren't making a lot of pressure yet. Test at 1800/2000/2300 with a load.

Measuring CC pressures can be a challenge. Especially on a 2-stroke Detroit.
Like a finger print, all engines will never match a book value real close.
During these test, book values should be considered guide lines.

The bottom line; Excessive CC pressures at max Q needs a repetitive procedure and result recording.

I'm hoping your just experimenting and maybe generating a base line for future readings.
Or, do you think you have a problem?

The oil trails in your pictures are typical of normal turbo slobber rather than CC pressures.

I have spent a lifetime chasing Detroit oil leaks. Yes, after much blood and grey hairs, you can succeed,,, for a short amount of time..
If you do not have a CCV system; The Racor CCV system does help greatly over the Walker mess.

Idle screw at the governor needs fresh copper washers it adjusted a couple of times.
Governor spring housing gasket requires replacement every ten years.
Oil pan screws could use a uniform tightening. Ect, ect;;

So you are explaining that you have a normal Detroit engine.
The ole slogan; if it's not leaking, It's not running correctly usually applies here.

LOLOLOL that's nothing for your style Detroits.