Benthochromis or Haplotaxodon microlepsis would be nice IMO, depending on what kind of featherfins you're planning on adding. I kept comps and calvus, along with lepidiolamprologus kendalli with some adult fronts years ago
The Ventralis will be too agressive from my experiences and they will not eat anything small such as comps unless you don't feed them at all. I have 3 lelupis and they are still in there doing fine. I have Benthos and they are a great combo with eachother.