There have been numerous discussions about this in the past.
Imo there's no room between Phantom and Wrath for a HF.
Phantom is relatively large and heavily armored for a LF.
Wrath is medium-sized for a VHF but one of the fastest, while having one less gun.
Phantom is going to get a torp slot and maybe some other small changes to make it a bit more of a "heavy" LF, while Wrath is going to stay fast/"low firepower" VHF.
in Liberty Avenger and Guardian even though relatively small are also not very fast, while Liberator is tiny, so there's quite a bit of room to try and fit a HF there.
similarly in Bretonia Templar is much bigger than Hussar and also significantly slower.
On the other hand in Kusari, Wyrm is almost same size as Chimaera leaving little room for a HF much like in rheinland
Igiss says: Martin, you give them a finger, they bite off your arm.