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In the past I've neglected dead-lift and squats(high reps and low weight) due to a fear that I would re-injure my back (I have L5-S1 Disc Degradation which acts up pretty bad from time to time).
Especially because of your back issues make sure to be completely focused on form. I gave myself tennis elbow doing this with bad form and had to take the last month or so off, starting back this week.
My new rule will be not only do I have to push the weight, the form on each rep, which normally degrades when you get tired, has to be perfect for me to move up now. At 50 now, I want to keep my injuries to a minimum. So on your heavy weights, I'd start at 50% of what you are doing now and intently focus on perfect form as you move back up and get your squats/deadlifts in the game. If you are really concerned about your back start from square one on those exercises, again focusing on making your form perfect now so it is a habit later and let the weight take care of itself.
I found a book called "Becoming a Supple Leopard" by Starett and the book is basically about form and mobility in exercise and how it translates to life/athletics. Odds are your back issues were because of bad form at some point in the past, I know reading the book was eye opening for me in that area.
Good Luck!
[This message has been edited by Jetpilot86 (edited 8/19/2014 8:39p).]