thank you very much, for help!I would suggest competition AOS on ANY setup. You have more boost and higher risk of blowby with bigger turbos so I rather eliminate even the slightest risk of blowby with the competition setup. Even if you are on E85 - sure you have to change the oil more often but compared to blowby that is the lesser of 2 evils.
I'm from russia and use 98 octane
93 USA octane = 98 russian octane