Thank you for clarifying that for me, @erik_squires ; the center of my midrange driver is at 34.5" above the floor. Being these are B&Ws, I would have to say that I am definitely too high.
For the time being I think it is going to be cheaper/easier/quicker to bring my ear level lower than to raise the speakers (although I am already considering that option). Tomorrow I am getting out the whiz-wheel & doing some surgery on the chair I am using right now. I will start looking into another chair as well. JerryG says that his IKEA chair gets his ears down to 37" which is lower than my tweeters but 2.5" higher than my midrange drivers--I may look into those.