[3.4 grape of wrath]

You're probably right about the 3/8 hose being too small, I use a single 5/8 hose. I have a vacuum gauge in the car hooked up to the drivers side valve cover to monitor crankcase vacuum. I actually don't run a catch can, air is dumped right to outside of car but only during boost. That tank was used for my water injection, it's no longer in my car. I also mounted the air pump vertically because crankcase garbage was collecting inside of pump.