If you are facing directly towards a tank they will have an easier time killing you, turn your tank diagonal to where they will be shooting at you. Every new angle you add to the round hitting you makes the damage model multiply and thus makes you harder to kill. The whole damage model is very complex but long story short the more you can steer away from 90degree angles the better, 45 degrees is ideal.
If you really want to get good go practice shooting the gv drones offline to find the spots where each tank is weakest.
This will also help your accuracy.
Here is a link to a thread I created for people like you spyder <S>
http://bbs.hitechcreations.com/smf/index.php/topic,260546.0.html
