The common watchband that terminates at each pin will drop your expensive instrument if either pin fails. Better is the type of band that makes a full loop around your wrist, passing under the instrument. Both pins would have to fail for it to come loose. And get a depth-compensating longer band, or one with an adjustment to fit around your wetsuit sleeve. Don't use abrasives or chemical solvents to clean your instruments.
Solvents are likely to attack the plastics used to house most instruments.
Your single most complex piece of equipment, the BC needs to grasp your body and your tank securely and to mount all kinds of accessories conveniently, besides adjusting buoyancy. There are many ways it can fall short of perfection, and many ways it can be improved. There's more to fiddle with than shoulder straps. Many BCs can be adjusted to reposition the lumbar pad, the tank band or the cummerbund. You may need to ask your dealer for help or read the instructions.