Did your taeniatus not come with any kind of morph name? A lot that are sold over here as 'plain' taeniatus are often very similar to the 'Nigeria Yellow' form, but unless they are labelled there is no way to be accurate and in no way can you sell any progeny as the morph you think they are unless you're pretty well 100% sure of them.
Your taeniatus look to me like the 'Lobe' form (page 192, The Cichlid Fishes of Western Africa, Lamboj 2004), the are fairly distinct as the male has no spots in the dorsal or caudal fin - just like yours. As far as I know, only this form (and 'Nange' which may be a natural hybrid between 'Lobe' and another form, 'Kienke') show this feature.
Here's a link to the Cichlid Room's page -
http://www.cichlidae.com/gallery/varieties.php?v=29
This might be relevant to your non-breeding as the Lobe River is recorded as having less than 1dKH, 4.8pH and a conductivity of only 10 microsiemens! In other words very, very, very soft acidic water! From the photos your female also needs to do a lot of filling out, she's nowhere near round enough to spawn yet.
I'd keep up the feeding, maybe add some frozen bloodworm (and good granular food) if you're not already feeding this - it seems to bring my dwarfs into breeding condition very rapidly - and for your water changes use pure RO water. This will slowly lower the hardness and maybe trigger the spawning. If not, you might have to put peat in your filter to lower pH further.
Good luck!
Edit: Forgot to say what an AWESOME tank this is! It looks amazing and just what I imagine the little creeks where these guys live must look like underwater. Great job!
, it's nice to know that someone likes my art
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