I've had a look in your profile, fantastic looking Angels. I used to breed Angels and they're very pretty fish but I find livebearers much more manageable. My last Angel brood was Big...over 250 juvenile Angels is not easy to manage!
I hear what you're saying about those 'difficult' strains. That's the trouble with recessive genes, you can't readily outcross without going back to square one. I'm trying something along those lines at the moment with magenta Guppies. There are at least four genes that are responsible for the magenta colour so I'll probably lose it completely but it's all part of the learning process, I may discover something along the way.