I have run large garrett and precision turbo's with a -8 drain etc, the volume of your drain isn't the issue. You think about how much oil can enter the core via a 1mm hole.
You say your running the drain of your catch cans to the turbo's sump/collector ?? I would suggest this is a bad move, biggest issue people have in these low mount situations is stopping the pressure etc on the vent of the sump/collector/turbo.... making it breath/vent through a line anything other than clear to atmo is a problem, and having oil from your can's also filling the turbo's sump is a very bad idea.
My scavenge pump stop's with the engine, the sump on turbo would be lucky to be 180ml, never had an issue.
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MY99 WRX EJ2.35L 720whp 9.48@147mph
https://youtu.be/c_lYEG0_Dyo
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