Quite an exercise, Jeff. And quite an improvement.
I'm glad to see you have gotten the sound to a place where you are satisfied.
Congrats.
I don't know about how EQ'ing the 200's and boosting the region (90-125hz) will effect the speakers, detrimental or not... but I doubt it would have much of an effect on the vocal range or dialogue of movies. (Not even sure if you were asking about that)
While I have NO experience here, my concern would be that because the dip is caused by cancellations and not the speakers inability of producing those frequencies, EQ'ing would not actually be able to solve the problem. I would be hesitant to increase those frequencies because they would still cancel themselves out regardless of the increase. I am also assuming that the measurements were taken from one spot (the sweet spot?), if so, these frequencies (as are many of mine) might actually be much higher... or lower... at other points in your room, and any EQ at those points could cause the sound at those places to be seriously imbalanced.
Of course, that's just a guess...
Either way... good luck there, and I hope someone can answer the question you specifically asked.
cheers!
shane