[Peter Finke]

What strikes me most is that your males (!) have no irridescent lines at the edges of their unpaired fins. I know this only in females. With males the lines are often slim but they are there. But as you describe the animals, they are really males. Dorsal filaments are often to be seen with different species, not rubrimontis only. The length of that filaments vary..
The most important question is: Where do you have got your fish from? If they are privately caught in Asia, there are many possibilities. If they are offspring of those fish, one must ask for possible hybrids. But I think you found them in trade, and that means: probably they are exemplars of the few species presently (= the last half of the year) in trade in Europe. Of course, sometimes it happens that a strange form/species is mixed with the more regular forms/species, but mostly this is not the case. And we have only very few species of Parosphromenus presently in the pet shops in European countries, mostly distributed by Ruinemans, Glaser or Imazoo. And that are spec. Sentang for the most, possible some so-called blue-line (I have seen very different fish called like this!), anjunganensis and ornaticauda. I have not heared of others traded presently. So I think, your fish are variants of the most-traded form, spec. Sentang. The filaments fit within the range of their appearance scheme. The absence of any striking markings too.
There is no better help than a good (!) photo. I am sorry.