Lanefan
Victoria Rules
Well, while they're ending in TPKs for you I would posit that's not the case for most other DMs running those same modules; and you seem (by many previous posts of yours) to know what you're doing as a DM.I have been running standard, pre-published adventures, as they were written. And they frequently end in TPKs after a couple sessions.
And so I'm going to turn this around and look at the players.
What are they doing that turns normally-winnable encounters into disaster? Further, what are they doing that's turning a simple defeat into a TPK?
--- Do the players/PCs have any sense of strategy and tactics, or do they just wade in face first and hope for the best?
--- Do any of the players ever have their PC(s) bail out and hide or flee when things start seriously going south, such that at least someone survives and the story/party/game can continue?
--- Before leaving town, do the players/PCs make sure they have a well-rounded party and-or do they recruit NPC adventurers to fill gaps in their lineup? (corollary: do you-as-DM allow and maybe even encourage this?)
--- Metagame: do your players just assume that every fight is winnable?
All of these are player-side issues that can only really be solved by player-side fixes.(other, perhaps, than the NPC adventurer piece). My suggestion is to somehow get them looking in the mirror if you can, and figure out where they're going wrong.