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update: problem fixed.
i did several things at the same time, so i don't know which one is the real solution.
first, i made a 1/32" restrictor. turns out the restrictor originally in the turbo is actually a 0.035", so i didn't use the one i made.
i also took out all the intake pipes and cleaned out all the oil in there. every piece of pipe was covered in oil. the bottom of the intercooler had a huge puddle in there.
i also rerouted the oil return so there are less horizontal travel. and from that, i was able to cut 2 inches off the length of the hose.
taking out the oil return caused a lot of engine oil to leak out, so i also did an oil change with 2L of Motul 300V and 3 L of 8100.
the result is that there were no blue smoke at all during the 15 minute sessions on the track.
but after the first hard session, an insane amount of smoke was coming from under the hood. the oil that leaked before got soaked byt he turbo blanket, and those oil were burning off. after that, the car is just fine with the exception of melted waste hoses
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