I think it has something to do with the way the propeller simulation has been modeled into each acft. Check the following list. The one you refer to has a better way of modeling
CFD: Computational Fluid Dynamics
SBS: Soft Body Simulation
// Airplanes //
• NPS_____________: Aerosoft Twin Otter
• ______CFD ______ : Airbus A310-300
• NPS_____________: Beechcraft King Air 350i
• NPS__CFD_______: BlackBox BN2 Islander
• NPS__CFD_______: BlackBox Trislander
• NPS__CFD_______: Bonanza G36 improvement project
• NPS__CFD_______: Camair 480
• NPS_____________: Cessna 152
• NPS__CFD___SBS : Cessna 172 G1000 (other variants not confirmed)
• NPS_____________: Cessna 208 B Grand Caravan EX
• ______CFD ______ : Cessna Citation Longitude
• ______CFD ______ : Curtiss JN-4 Jenny
• NPS__CFD_______: DA40-NGX Improvement Mod
• NPS__CFD_______: DA62X Improvement Mod
• NPS__CFD_______: DC Designs PT-17 Stearman
• ______CFD ______ : DG Aviation DG-1001E neo
• ______CFD ______ : DG Aviation LS8-18
• ______CFD ______ : Douglas DC-3
• NPS__CFD_______: FlyingIron F6F-5 Hellcat
• NPS__CFD_______: FlyingIron P-38L
• NPS_____________: FlyingIron Spitfire MkIX
• NPS_____________: Freedom Fox, Fox2
• NPS__CFD_______: FSReborn Sting S4
• NPS__CFD_______: GotGravel Monster NXCub, Savage Grravel, Savage Carbon
• ______CFD ______ : GotFriends Discus-2c
• ______CFD ______ : Grumman G-21A Goose
• NPS__CFD_______: iniBuilds P-40F WarHawk
• NPS_____________: Milviz Cessna 310
• NPS_____________: Robin DR-400-140b Dauphin mod
• NPS__CFD_______: Savoia-Marchetti S.55
• NPS_____________: Van’s RV-7 and RV-7A
CFD having problems with AP stability (shakes from side to side) Check the C172 with G1000.