I'm just full of questions this morning.

First step is to insure that the engine crankcase is not overfilled. That is the cause of the vast majority of oil from the crankcase vent.

Best advice, call your engine manufacturer with your engine serial number.

Then at the next oil change, CALIBRATE THE ENGINE OIL DIPSTICK. Most dipsticks were NOT supplied by the engine manufacturer, but by the chassis manufacturer. Do not ASSUME that they are accurate.

Lastly, do not add oil until it drops to the "add" mark on a properly calibrated dipstick.

I'm working on solving a similar problem on Cat C7. Unlike your Cummins the early C7 had problems with too much blow by from the side breather. I've rerouted the breather up and over the engine to give the oil more time to drain down, but have not put enough miles on it to see if this helps.
ASSUMING it's not overfilled and you do not have excessive blow by because of dirt getting into the engine (check hose fittings between the turbo and air filter) I would make a oil trap. Route the slobber tube into the bottom of a large mouth plastic gallon jug filled with steel wool. Replace the steel wool at every oil change..$10.

I routed the slobber tube into a large mouth 1/2 gallon milk jug tied to the frame and that collects all the slobber. I empty or replace the milk jug every oil change. No oil on anything now.

Put you catch can on that slobber tube & then when you fuel up, just check to see how much is in it & dump it out.
Walla, no more slobber on the toad.

That is an old racing Kart idea, but those on the Karts were enclosed & had vent tubes at the top to vent the pressure & then a drain at the bottom you could open to drain the tank after the race.
Neil