Who are you facing?
I would say drop the special weapons on the slugga boyz, but you've probably heard it a million times and want to go with them anyway.
In hammer and anvil, the "green trickle" might not work so well, considering they have a long way to walk after coming in from your board edge, and you'll want all the killing power you can get in purge the alien.
The Kanz are going to get slaughtered if you go for a Kan wall, even with the
kff. You'll probably have to keep them on the flanks,which is sad, but if you don't you're practically giving your opponent 3
VPs.
Try to use the slugga boyz to take any focus from the shoota boyz (since the shoota boyz will probably be doing the most out of the two).
Other than that, rush forward, focus one unit at a time, and hope for the best.
That's my two cents (take it with a grain of salt, though. I'm very new, as you can see

)