Well deadlifts is a compound exercise so you are using more than your lower back. The first few inches of the deadlift are using your hamstrings then after that it's all up to your back and the final strecth is your traps.
The reason you could do 50lbs more, was due to the fact the ROM (Range Of Motion) was shorter
If you just want to focus on your lower back development than you can do it your way, but that might stop your 'normal' deadlift from progressin as much



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Dat wood be a first...

