Calibration - nozzle is high between the towers

I have a calibration issue that has me a bit perplexed. I have adjusted the printer dimensions using the standard iteration procedures such that, in the image below, points C, 1, 3, and 5 are perfect. However, the nozzle is a little bit high at points 2, 4, and 6. At this point I think that the bed itself is flat. Is it possible that I have arrived at a combination of rod length and printer radius settings which are off just a bit and would yield this result? Would correcting this issue mean that my rod length is too short or too long?

Any help is appreciated, thanks!

Bill Cook _/)_

This is fairly common issue with deltas. You'll find MANY threads discussing this in the SeeMeCNC forums.
Basically you need to make sure every tower is as close to perpendicular to the bed as possible - even 2-3deg of lean in or out can effect calibration.
Once that is as close as you can get it, run through the calibration wizard here:
escher3d Calibration Wizard

If you don't have a z-probe like me, you'll be spending some time on it, but the results are worth it. Good luck!

BRILLIANT! Thank you. I should have thought to look at the SeeMeCNC forum.

And that calibration wizard looks like it'll help a ton.

Thanks again!