There is more power there going by your AFR's...Regardless of what Romanos say (who are renowned for liking rich tunes), AFR's in the 10's (and lower) are not conducive to good power...
You'll find that up high in the revs the AFR's are below 10:1... Most WBO2 sensors flat line at 10:1, as can be seen on your graph...
Ahh Nebo... So you didn't go all the way to the T?
Now you know how a real SAUQLD cruise goes...