About the flight model it indeed feels updated , not in a PFM way but it is scripted a bit better. Now it feels that the engines have a bit more power , it bleeds energy a bit slower and it has a higher turn rate at slow speed(form what i've noticed). Once the fuel drops lower than 1500kg i think it somewhat matches the sukhoi-27/33 in turn rate and has a VERY good acceleration. This is what i noticed between patch 1.53 and 1.54 .