Hi tfires,
Sorry to hear about your tire troubles.
Tire blowout discussions generate heated opinions. Tire experts are pretty uniform that most blowouts are caused by heat damage to the tire's internal structure, or by weakening the internal structure by running over curbs or similar obstacles. They also say that manufacturing defects cause some failures, but a minority.
One of the problems in figuring out the why is that damage doesn't cause an immediate blowout. Heat damage caused by under inflation, overloading, or driving too fast may be followed by a blowout months later. Btw, you should have your tires at 80psi and your max speed no more than 65 - lower being better.
Some people recommend you should move to a G rated tire (and if necessary to wheels with a 110psi rating), noting that Goodyear G614 tires have a very good rep. They have quite a bit more steel protecting the internal structure from damage. They're rated for higher speeds. When fully inflated, they carry 3750 pounds, providing significant margin relative to E rated tires. Combining all these factors, the chance of a future blowout would be pretty low. Of course none of this comes for free; they also cost quite a bit more.
Others will recommend E rated tires that seem to have a better rep. But it's hard to tell if the better rep is because of higher quality, or if the number in use is so low that whatever incidents occur don't generate a lot of failure reports.
I'm sure your post will generate a bunch of responses.