AC EVO (0.9.1): Something in the aerodynamic model is holding back the SF-25...?

My best lap at Monza after 0.9.1 update, but still the car is 1.5 seconds slower than before! Maybe a bug in aerodynamics? No assists/PRO. My current sim-racing-setup: -T300RS-base with Ferrari F1 add-on-wheel -steel tube rig (welded) -Win11 PC, Ryzen7, RTX 2070 Super, 16 GB RAM -single curved monitor