Keith J. Attkiss, MD

There is almost always some dried blood on the steristrips from a bit of oozing from the skin a few days after surgery.  Your surgeon will probably replace the steristrip with a new one when he sees you again. It's nothing to worry about. 

It would be helpful to see a photo, but areas that get infected are more inflamed and take longer to soften. Even the normal part of the scar can take a few months to turn the corner, so I'd be patient and wait at least 6 months to assess it with your surgeon. Some recommend massaging the firm area, but I do not believe it makes a difference versus simply waiting.

Yes, if everything looks good and feels good at 15 days, you have nothing to worry about. Enjoy your results.

There is no way to slowly deflate your saline implant. Not sure why you want to, but it is not safe to do it yourself, and rarely is there a reason for your surgeon to do it either.

The problem is really the loose skin around the belly button, not the small muscle separation. Even if the muscle could be fixed via an endoscope, it wouldn't make any improvement. There is no scarless way to tighten the skin around the belly button. Fortunately or unfortunately, depending on your perspective, you fall into the category of someone who looks too good for a tummy tuck and the required scar.