I think its a very beatiful species actually. They look pretty much like my first paros.
Identification though is one of the difficult ones I am sure.
The ‘lancet’ like caudal fin to me is not lancet like. If you look at the caudal fin in those fish in the photo where you can see it all spread out, it seems to me to be round. Even some ’round’ caudal fins can appear lancet like when not fully spread out, they kind of fold and look pointed, but they are not really.
Again, theres no doubt in my mind that they are part of the ‘bintan’- type forms, whatever that will mean. To say p.bintan is something which I would not be able to, – I am actually very uncertain what would indicate a definite p.bintan. That would be for more experts to say.
But this particular fish look to me similar to those species or variants which has been going under the identification as spec. sentang or blue line.
When I had mine, they were initially identified as p.spec.sentang.
I looked again at the first photos you uploaded in this thread, and what still strikes me is the very brownish colour which at an earlier stage was quite dominant in the caudal fin. This might help narrow things down perhaps ?
In the photo at least you have 3 females, but I am sure you have also noticed.