Hi there,
Had the same issue with BS2. Use the "slow zoom" to adjust the level of zoom. I've mapped the "slow zooms" to my throttle for ease of use.
A10C, I use the seat adjustment to raise and lower my perspective. seem to remember you can't map to this button - real shame - so you have to click on the switch. You can also just recentre (f12) TIR. IF you want to sit low, recentre while you're sitting up. not found this necessary myself. Seat adjustment and zoom does for me.
Enjoy
If you like IFR and the all the buttons to hand then Helios is excellent. if you got the hardware (GPU), 2nd monitor and some patience to figure it all out it can really enhance your experience.
Enjoy