Yes, you should check it. I responded to your other post, but for the record the ball bearing is located under the pressure switch which is located in the back of the engine bay behind the air cleaner (#47) in the picture below. You'll need a magnet to pull the ball out of the housing.
Installing the 3/8 inch ball bearing (9.5mm) helped quite a bit, but I found that oil would still backflow into the turbo on occasion - especially after a hard run. To fix this, I installed a 7/16 inch (11.1mm) bearing. I verified that I'm getting plenty of oil flow so I'm confident I'm not going to wipe my bearings (see oil stream in image below).
Edit: I suspect that the new cam oil restrictors I installed during a chain tensioner upgrade may have exacerbated this. The added oil pressure would increase flow, so at engine shutoff it may have been enough to overfill the drip tank and back it up into the vent tube.