the Advent LRF has TOO MUCH hull in comparison to other types of units (particularly Guardians), and in reference to the entire Advent race. The Advent's ship survivability comes from their SHIELDS. Not hulls, like the TEC, or a combo, like the Vasari.
While what you say IS TRUE, you also need to take into account that certain things should be different, like the LRF changes. With the TEC's LRF, I don't think that there is a need to change it. With the Assailants though, they are JUST TOO WEAK IN COMPARISON TO THE OTHER RACES LRFs. Yeah, they're a tier 1 unit. But they should still have some survivability against enemy ships of a comparable type.
Ideally IMO, the Illums should get the least HULL points, but have the highest SHIELD points. They can also have a raised mitigation (Advent are shield masters after all), I don't mind that. The Vasari Assailants should get a LITTLE bit more survivability, or their hull/shield researches should offer better effects on the Assailants.
The TEC Javelis is fine as-is I think.