Yep. I don't see what benefit could come from dropping even more weight.
Did you do the V-Diet earlier this year?
Either way, it makes sense that you've slacked on the diet, as that's a big reason for not seeing decent results. Focus on getting about 180 grams of high quality protein (chicken, beef, whole eggs, etc.) per day. Protein is what builds muscle, so without enough of it, you're not going anywhere. And eat enough total calories everyday so the scale goes up each week. As long as the scale's moving up and you're gaining strength in the gym, you're almost-definitely on the right track.
How do you only have a "theoretical 1RM" if you're doing 5/3/1? It requires you to actually know your 1RM before starting, so you can figure out your training max and build the weekly percentages off of that.
Why? If we say you're 9% or 12% or 16%, how's that going to effect your diet and training? Bodyfat percentages have zero real-world meaning. Online guesstimates based on two poorly posed pictures are even less useful.