Interesting idea with the canisters. Should provide a "buffer" for the ever changing flow.
One thing I keep looking at is where the two lines T into one. On any given system the fluid will always flow to/from the easiest path. It could be possible that you have suction to your primary line but after the T it ends up effectively only drawing from one side.
Positive thinking here that your current setup works...
But if unfortunately it doesn't. Possibly replace the T with a Y and have the Y slightly above your canister. Might help draw both sides evenly.
Another idea is to add an additional line that just connects the two canisters. This way if the draw varies from side to side they can still balance themselves out.
What is the fitting on the top of your catch canisters?
Also what diameter are your oil restrictors?
Waiting for the positive update.
Mike
It is air vents on the top of the canisters
Many who have twin turbo has these setup, pumps, T-connectors, etc.
Strangely enough, they get it to work.
This is my final setup
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Check valve with 2 psi cracking pressure installed pre-turbo and 3m.m restrictor.
Smaller catch canister with oil sump suction from the bottom.
2 smaller gear pumps (one each turbo)
Turbo timer 30 seconds.
(Maybe even check valves between the turbo and oil pan)
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It would be damned if it does´nt work