I don't know if it'll help or not (it's not an advanced technique or anything), but I use a larger needle for my bind offs to make them more stretchy. Sometimes I use a needle just a size or two larger, othertimes I've used needles twice the size of the regular needle--it just depends on how stretchy I need it to be, the yarn used, etc.
I have a larger head than "typical" so I can identify with this situation.
