The stabilizer is difficult to get right but when it is, Steyrs are the best guns to shoot. Getting it right takes a long time and involves mucking around with the reg as well as the physical adjustment on the unit itself. They all vary from gun to gun so i cant help with measurements, but the "have it level with the back of the action when cocked" theory is not correct. I use a "base" setting of 25mm protrusion when released whilst being held on a solid surface (with the unit removed and horizontal) at aprox 88bar. I reckon it may not be of any use to you though as i figure from your location that youll be running more horsepower than it was designed for (as are FT/ HFT shooters to a slightly lesser extent) as it original design is for 6bhp. Ive got an Anschutz 8002 with a similar system and cant get that right yet, but that is purely designed to run at 10 metre speeds and needs further work with weight/spring.
THE TANGLED WEB OF DECEPTION!
VINNIES B1TCH NO MORE!