You could also try starting with your hips a little higher, but that's more a personal thing I think. Have the tried the whole 'crush an orange in your armpits' cue to help breace you middle and upper back? I do that when standing above the bar when I brace my midsection and it makes my pulls a lot more comfortable. You kind of squeeze your armpits in and down. It sounds weird, but feels good once you do it.
For bar placement, bar over midfoot (I think in terms of middle of my arch for myself) is a good place as far as I know; or I've even heard that where the bar sits when you've put it down is good too.
I wouldn't think you'll get hurt like this, especially if you're sensible about your progression.