Hmm, I seem to remember that one of the fixes, and one I really liked, was to give them a FR 50, or some arbitrary number) effect, that obviously never overloads, and ignore the infinite number of Dodges. In this case, how often they dodge wasn't as big an issue; the fact that they didn't avoid the attack every time balanced it out. They'd have the regular amount, maybe their hyped up kind involving explosions, and let the field "invul save" carry them most of the way.
I'm trying to stat the Culexus and Callidus Assassins, sort of like how the Eversor is done in Ascension, so I don't particularly need it to be PC-fair; they are the opposition, not a player Vindicare everyone hates. Still, if they work similarly, I didn't want them to be two more unkillable behemoths of death, so if I could work in the fixes, so they were terrifying, but not auto-TPK. As is, they are each giving me their own little hick-ups, combining the nerfing the Inquisitorial part of Daemonhunters got in the new Codex (my overall best source for gear and specials) and the rules themselves, making them work in game. Vindicare are lucky that they are "just" super-snipers. I am having to figure out super-null, draining field, polymorphine, and such, which might be why the book said, "for the other, do the Eversor."
As to Unn, Toughness and Strength, they all have them, and they have them because most everything they fight is better than Humans. If a Callidus is going to impersonate an Ork, the least she can do is be durable enough to play the part, while the Assassin called to fight the Word Bearers will need to be able to fend off CSMs and Daemons. They aren't for your run-of-the-mill kills, but for the big bads, who MUST fall. Just be happy they don't follow the Eldar, and have Unn. Agility (oh yeah, Vin can get that ).
As a second, minus just saying "no, Unnatural Traits are only fair for NPCs and Space Marines!" would it be out of place to give the Callidus Unnatural Fellowship, and/or the Culexus Unnatural Willpower? Making Deceive and Disguise checks is a lot of the Callidus's job, while increasing the range of the psi-disruption (Radical's Handbook, p.38, I prefer it to the other version in Disciples of the Dark Gods) could be critical to a lone Culexus. Thanks again, folks, for all the help.