Sorry to jump in AGAIN, and I hesitate to suggest them.

If you are having that many issues you may want to consider airless tires. These are foam filled tires that of course will never go flat as they require no air. The "leading" supplier of these has a horrible reputation, so I won't even mention them. Some people swear by the tires, others swear AT them. Most say the increase rolling resistance significantly. I've never tried them. They look to be about 20-30$ each.