TriStar 1.0.2: Unable to set stabilizer trim auto-rotates back to 2

[dragon8]

Not sure if I'm missing anything here, I've repeatedly started up the aircraft from cold & dark performing all FE functions manually. But each time I'm unable to set the stabilizer trim to the T.0. perf calculated value such as 3.69 (per my latest attempt).  Despite all 4 hydraulic systems pressurized, I'm unable to set the stabilizer trim. When I rotate the trim wheel to the target setting, it slowly rotates back to 2