On double hets you have a 1in 16 chance of hitting on the double homo. I breed double het vpi snows last year and out of 5 eggs I got 1 albino phet axanthic, 1 axanthic phet albino, and 3 pdh's. It was a fun breeding and no snow means they are breeding again this year.

Double het males are reasonable, but it also depends what you are working on.