It's funny, Jo was saying that the mirages have a ton of bow lift (in Beck427's thread on OSO), but I'm running mirage + and the boat feels like it's got a bit of bow steer and an itch to spin rather than porpise when I run it in the ocean (It did seem to porpise in the river though)...
The Bennett tabs are basically useless though, which is why I'm converting to the 260s K planes. Hopefully that helps. Also need to bleed the steering and try some different props. Plus raising the motors of course...