Under Extrusion on corners

Hello, I have a newly built V4 Hybrid and the first print is the skew print from the guide. But it seems that on corners I get under extrusion and then things start to peel off. I haev the default PS profile with Prusament PETG, Orbiter 2 and Rapido 0.6 UHF. What could I try to fix this thing please? Thank you in advance