well, I tried sitting straight for like 2 or 3 months. To be honest, I couldn't drive more than 100km before my arms hurt, having my hands at 9 and 3. As a band-aid, I would move my hands to 7 and 5 on the highway, to give them some rest.
Right now, I've tried tilting the seat back a a bit, and my back feels much better. Also, I moved the seat up.
Now, my question is: before, I couldn't see the right edge of the hood. Now, I can see it if I move my head.
If I move my seat further up, I can see the right edge at all times.
Any ideas? Should I choose the highest or lowest position possible, in regards to how much I can see out of the car?