I have long femurs an short arms, which means that my back angle on conventional deadlifts is 10-15 degrees. I feel a lot of strain in the lumbar spine - back position is not really rounded but not 100% neutral on heavy lifts either. The other day I strained something in my back, whether a disc or muscle I’m not sure but it could be worse and I saw this coming from a mile away. I have been experimenting with a sumo stance, but technique is by far the limiting factor. I have a much more upright position with a moderate sumo stance, but the problem is that I have no drive off the floor. Conventional - 485x3 (not T&G), 230kg in competition - failed 247.5 due to excuses. 425 (about 380 kg) lbs. is easy in a sumo stance, but 455 (212kg) wouldn’t move.
I know, spread the floor and fire glutes at the same time, but any other advice? Specific assistance lifts?
Sorry for the kg’s and lbs., in Canada we train in pounds and compete in kilos.