Good idea, actually. The fact is, one side always compensates a little for the other on bb lifts, especially big compund ones. Db's...well...you cannot. Still, change up your routine to incorperate...
I also go about 18% as there's a decent amount of lean mass there. SLOW addition of cardio to find what your maint rate, and stay 500 k cals below daily. Keep your lean proteins over 175g per day,...
12 seems right, good physique. Going to 10% would mean dropping about 4-5lbs if done perfectly (meaning very little muscle loss). So, at 1lb per week (don't go over this or you can almost NOT avoid...
I agree with 16, and your delts are thick as fukk. Good thing, meaning now to lean a bit, you'll have the beastly look yet keep athletic look. Traps need work to balance the delts, so work loads of...
Right now, OP, I'd guess over 11% regardless of how lean you are due to lack of mass. However, prepare to put on only 5-10lbs pf mass per year, and don't rush it...now go get em bro.