the flm cvd has a extra thick spot in the exact spot that you are bending them.
http://www.rc-monster.com/proddetail...lm26515&cat=29

also in my experience if you run some tires with big side walls like the ones liked below you will never bend any axle because the tire just compresses
http://www3.towerhobbies.com/cgi-bin...?&I=LXPZV4&P=7
you could also try mashers 2k or moabs (i run 30 series moabs and the ones liked above)