Why WasteKing disposal throws water up?
There's a good chance the disposal was larger than needed for your house hold. Three people households will do great with a 1/3 to 1/2 HP disposal. larger the 5 people would use the higher RPM and HP. Those high RPM models need to have a lot of stuff in them before turning them on. I've always had In-Sink-Erator disposals, 1/3 to 1/2 HP and have never had any problems, and that's with a household of 4.
Are you sure the splash guard hasn't been damaged or cut? I once got a call to replace one because the customer cut some of the fins out of it so stuff would go down faster. Then stuff splashed out so they wanted a new splash guard.


You might want to check the plumbing to make sure there's not a partial blockage that could be causing the initial back splash.