What on earth happened to drop your deadlift from an easy 300# to a 1RM of 190! That may help point in a direction.
Other than that changing up your rep and set schemes can help. Also if you haven't taken any time off in a while taking a deload week or two and only working at 50-60% capacity may give your body the break it needs to come back stronger.
The best workout is the one your not doing. Sometimes you just gotta throw in some variance.