> If this is the intention of any of my candidates coming in and they call this "real commitment" to work for my company they would not pass the phone interview

There is a very easy way to filter out candidates who want to leave in 1-2 years. Structure your equity vesting so that there's minimal vesting for the first 2-3 years, with a sizable severance package to protect against involuntary termination. I don't understand why you would give someone 30% equity after 2 years, if you're then going to begrudge them leaving.