My thoughts (for whatever they are worth!):
The "rule" with all male tanks is only one male per species and not fish that look similar. I have managed to have two ruby reds in one tank before, but it's always a risk. Your dragon blood is a bad idea (sorry, my opinion) as they tend to be much more aggressive that what is useful in an all male tank. A few nice additions would include an otopharynx lithobates and some stuartgranti peacocks of various types. An albino Taiwan Reef would be nice. The jacobfriberghi peacocks generally are too aggressive IMHO.
I'd also add a few more rocks with more hiding places. I also sometimes put Mopani wood in African tanks and some plants (well, I put plants in all my tanks.) Some vals or anubais would like nice and give you more sight breaks.
I'd not put a frontosa in because, well, it doesn't seem to go for purely aesthetic reasons. I've never had them and don't know if they have the personality for an all male tank. I just like the looks of peacocks and haps together without others. I don't even likes labs, even though they are just fine temperament wise.