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Porpoising on turns and strange KIAS readings

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I'm getting a strange and undesirable porpoising effect in turns with Mike Stone's Gmax 757. No matter which airfile I swap it out with the bobbing persists and I get strange, unusually low indicated airspeeds of around 105-115 knots on final. This can't be right. I fly heavies all of the time and expect nothing less than 145-155 final approach speeds normally, with no problems in any other aircraft in my hangar. All software and drivers up-to-date, including FSUIPC, and I usually have FS meteo running during flight. Anyone else experiencing this? Anyone have any ideas? Thanks in advance!Alex CN562ZMinneapolis, MN

PowerSpec G426 PC running Windows 11 Pro 64-bit OS, Intel Core i7 11700K @ 3.60GHz 30 °C, 4089MB NVIDIA GeForce RTX 4070 , ASUS TUF Z590-Plus Gaming motherboard, Samsung 870 EVO 2TB SSD, Samsung 750 EVO 500GB SSD, Acer Predator X34 34" curved monitor (external view), RealSim Gear G-1000 avionics suite, RealSim Gear GNS 450, Slavix Stay Level Custom Metal Panel, Honeycomb Alpha Yoke, Redbird Alloy THI, Saitek Combat Rudder Pedals.

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