since i started training properly, i have began to notice a sticking point in my deadlifting. i seem to have real problems getting it off the floor but find it easier to power through once i get the bar to around the knees. ive swtched my technique from convential to sumo stance and easily equalled my pr, yet when i added further weight i failed to lift it off the floor, even though the weight increase was negligable, and considering that i breezed through my pr, i feel this is strange. this is beginning to lead to a rounded back. im not the most flexible of people although have spent a good amount of time stretching over the past year or so. i was thinking of increase the depth that i go on the squat to help get that initial lift off. has anyone got any helpful ideas, thanks.