Let's take your example. In the two year period of 1976 and 1977, real wages grew from $21.53 to $22.13. In the 18 months that followed, they fell from $22.13 to $21.36. That's a net loss of $0.17 in that 3.5 year period. You can say that wages "outperformed inflation" for the majority of that time period if you like, but you are purposefully omitting the important data
What important data exactly?
But let me guess, you are talking about that spike in wages in 1973 and a few years before. On that account, you come to the conclusion that in the majority of the post-WWII time increase in wages hadn't been on par with inflation. However, if it really were so, we would
now have real wages lower than they were at the beginning of that period. So no matter how you try to dance around this, even according to your own stats, wages had been growing before 1973 and has been growing since then as well