Various Clifford RS3.5 Questions

I got the rsx 3.5 2 way pager system installed and i have a few questions.. The installer set the shock sensor all the way to max (right), so i set it to the middle, its still sensitive as hell especially when an airplane comes over or someone shuts a door next to my car. Is this normal? And turning the little dial on it too much, will that degrade sensitivity over time? I had a piezo tweeter siren installed on the inside, how reliable are these and do they last a long time? The sh*t is MAD loud and annoying, instant headache! How much of a battery drain is the piezo? Range, right now, i can start my car from about a block away. I do have tint, and the antenna is mounted in the rear window dash. What can i do to increase range? Any secret tips other than upgrading to better batteries? Is there a way to adjust sensitivity on the remote and does it have a backlight? thnx!