I have been running Sougi 6000 for nearly 2 years now on eflex, no issues with breaking down or going milky. I still have 6 bottles left, I have no idea what i will change to when they run out.
Winter is the time to watch as cold starts are an issue with plenty of fuel washing down past the rings. I used 300v with a low temp thermostat and it turned into a milky mess, I dont seem to have any problems now I replaced the stock thermostat. VQ engine/oil temps sit at around 87 degrees which is hot enough to evaporate any ethanol into the catch can. I doubt you will have issues like this on the track as the oil temps will be high.