I have been flying my test quad with R196 and the gimbal code I've been using for a while to see if things are cool. Since I get bored I have a tendency to do things that end badly, the tree in the back yard grew to much last year and I hit it going underneath and it flipped to the ground with just a broken prop.
I changed the prop and it was all screwed up and couldn't get it balanced at all, I grabbed another new prop and the same thing. I figured I may have zapped the motor so I changed it with no luck.
I then swapped the left and right prop and the roll imbalanced went to the opposite side. Huge difference in props. I put the RCTimer 15 x 5.5 props on my test stand and these are the numbers I got in grams full throttle. The 2 props 670 and 690 were the ones I used to replace the broken one and had much less thrust than it's mate.
I doubt their molds have changed, but the demand is so high they're probably pulling them out of the mold too soon.
The ones on the high and low side I tripple checked.