Using Ala Mhigo as an example it is successful in most parties to pull up to the first wall and I think any tank should start that dungeon that way unless they know for sure that there is a weak link in their group. If that goes off without a hitch I don't think there is any harm in trying the largest pulls you can from there on out.
Most dungeons have a similar pull to start them off - Skalla has two packs up to a wall, Temple of the Fist has the Couerls and the moss wall that spawns adds and Kugane also begins with a technically two-pack pull that is rather manageable.
A good tank will take that opportunity to gague the group and assess whether they can handle some of the larger pulls later on. If you've lost someome during the opening pull that is smaller than some of the potential megapulls earlier on then slow it down, if your healer and dps were mostly AoEing down the packs though...
So yeah, I say pull big until you have a reason not to. Whether that reason is your own lack of confidence, a healer asking for smaller pulls or derp dps doesn't really matter. Will you wipe on occasion? Sure, but the vast majority of the time things will go fine and the time you'd lose single pulling by default will far outweigh the rare wipe on a larger pull.
Clearly communication would be preferable but if that isn't an option and we're just trying to establish a fair baselinr I think this is the most reasonable one.