Well, SlowPRO here is really just meant to wall physical sweepers that threaten my other wall, Chansey, as well as come in on physical hits altogether. I need Scald so I can cripple said physical sweepers so they aren't as threatening to my team anymore. I like to be safe with my walls, hence the extra form of recovery in Slack Off, because with my luck, he'll get a nice crit to the face upon a switch in, and we all know how unfortunate those can be. Lastly, Dragonite can have Extremespeed with Multiscale.
Only thing I have that can dodge a ground attack is Dragonite, Landorus isn't the bulkiest of Pokemon, so if I can get it low and predict his arrival, a nicely timed Extremespeed should take care of him. As for Excadrill, oddly enough, I haven't had much of a problem with him, Conkeldurr usually deals with him well. Though as a safety measure, I was thinking of putting Mach Punch in somewhere.
Anyway, thanks for the suggestions! ^^