Wow, only 65 of 400 TY's were good? That sucks! They must have been stored in the ships boiler. You burned them at 16x, I've done a few at 16x and they were just fine, but I usually burn at 8x, the 4 min. extra doesn't bother me, it's quality I'm after.
I'm surprised that you prefer Memorex, these have serious quality issues because they use so many different manufacturers, lots of complaints if you read the threads. You say that they were manufactured in India? Are they Moser Bears? I've heard they are excellent but have never seen them in the States.