Let me add something about doubles. Like everything in diving there is a delicate balance in weight, position of the weight and your buoyancy. Like weighting with a weight belt, you should be able to achieve neutral buoyancy with your doubles rig without being overweight. Being able to swim your doubles if you have a wing failure is something that should be considered. It is this same thing the I have in mind when I am using the doubles with my drysuit, I can achieve neutral buoyancy and surface these without air in my wing; while I would not attempt these with a 3mm wet suit. With some research you will find out what works best for you.
Best fishes!!!