Mrzap, your back should NOT round your back when doing deads, that is very dangerous and can and will (eventually) lead to injury. It sounds to me like a flexibility issue if you can't get into position to pull from the floor properly, probably hamstring flexibility or possibly weak hip flexors, stretch out your hamstrings and lower back for 10 minutes or so prior to all of your workouts, when doing squats go ass to the floor, with a wide stance to incorporate the hips and hamstrings, to ass to the floor front sqats, on leg presses bury your knees into your chest (just be careful not to raise your ass off the seat, as this will also ruin the back). Also, Straight-Leg deadlifts, goodmornings, full range of motion situps, hyper extensions and reverse hypers can help you, so can romanian deadlifts(but have someone who knows what they're doing show these to you because they can F you up if done incorrectly). Try some or all of these to see if you can correct the problem....but DO NOT perform deadlifts with a rounded back.