Have you replaced the brake booster? There is a pushrod that applies pressure to the master cylinder and it's certainly possible that it is out of adjustment. Since you seem to have replaced darn near everything else you might as well as check the booster and scratch it off the list of possibilities.
I had a car, I think a 91 Corolla, where an honest and pretty trust worthy shop replaced the master cylinder, but the brakes were still a bit lousy. I suggested the push rod but they said "oh you should never touch that" or something. They didn't want to mess with it. So, I did it myself and it helped.
On a beater car a couple years later, I was trying to adjust it and it got out to car and totally locked the brakes when I applied it. Thankfully I was a 2 minute run from home so I ran back, grabbed my tools because I foolishly didn't toss em in for the test drive, adjusted it on the side of the highway enough to get it rolling again and u-turned back home for better adjusting.
I had to do a minor adjustment on the RV's new booster to get it working well. I got on residential street with almost no traffic. I would drive a couple blocks, brake and stop at the curb, hop out and adjust real fast, hop back in and repeat until it felt right without dragging or locking up. After 3-4 times, I had it good.
I went overboard on adjusting the F250's push rod s a couple years ago. It was dragging the brakes, literally making the front pads smoke and losing most stopping power.