If you are dropped then the numbers would be closer to -2.5 on BOTH sides. THis could be higher or lower depending on the drop. Our race setup was about that initially and within 0.2 from side to side.
You are way out of spec and the difference is large-I would suggest that you put the car on a frame machine to be absolutely certain. It is not cheap but will help pinpoint the reason. Another thing is that you could well have a bent control arm or the bracket location (frame machine for the latter) is off.