Weird issue with my SR.... Lots of questions!

[HaLo]

Hey guys,

Got a question for you.

2 days ago, my dipstick shot out and poured some oil in the engine bay on my S13 SR. It did that on a 1-2-3 up to 120km/h on 7psi and the stock T25.

I tested the compression: 150 psi on all 4 cylinders.
I checked the PCV valve, it seems to work properly.
There is no oil in the blow-off valve or intercooler piping.
When the blow-by occured, all gauges were reading nominal, except oil pressure that might be a tad too high.

I recently intalled a catch can in between the Valve cover T and the intake. The hoses are a little smaller than the oem ones. Could that be it?

Another thing I notice: Inside the black hose between the black box and the Valve cover T, there is a small brass "restrictor" that reduces the diameter of the opening to maybe a 3mm diameter circle: IS that supposed to be there?

I also notice I might have put too much oil on the last oil change. I put maybe around 4.5L, which would be 0.8L too much. Would that cause the dipstick to fly out?

Can I assume that my turbo seals are ok, since there is no oil in the BOV and it doesn't smoke?

Can I assume my rings are ok because my compression yields very good results?

I am thinking I might have had too much oil and it might've been the cause...

What is your verdict?