I understand your problem finding matches. I also have degrees and seldom find others with them outside of labs and/or universities. Inside both environments men are bombarded with anti-harassment training to the point where we just don’t want to risk starting. Also, I suspect that Tucson has more PhDs than Omaha but still not many. If I lived in AZ I would definitely ask you out.

Maybe you're over qualified..(joking)

Maybe you will have to "Lower The Bar"

Sometimes opposites attract.

Unless you're subconsciously sending out the message you want to be single.

I wonder what you'll accept as a "close" match?
Your education level and scholarly accomplishments are impressive. Will a potential date for you need to approach that level? That will limit your pool considerably.
Location is a big issue too. If we had teleport pods dating would be much easier.
The site is small still, compared to Match, for instance (which I haven't tried).
After 4 yrs or so of online dating, I've had the most luck with POF. It's gignormous and free and full of deceivers and nuts. Strenuous culling and ignoring is required. But their numbers are so big, I've found success there by learning to cull effectively.
Women probably cull at ten times my rate. I'm not sure you're up for that.
So I'd say patience. But you've heard that already.

You might want to include a photograph of yourself.

yep, billions of people on the planet and no-one ticks the right boxes.
Just shows how unique you/we are.
In all honesty though, I think it is much harder as we get older, more stuck in our ways, fussier, less inclined to compromise.

Um, it would help if you put up a recent photo of yourself, since that's often the first/only thing most men look at.

It can take a while to find a match, especially for high achievers.

Uniqueness...

1. How come you got a job and others dont?
2. How come your set up and others are not?
3. How come you got money and others dont?
4. How come your youtfull and other are not.
   Hang in there.