You don't want to eat potatoes pre-workout, because as you said it will be stored as fat if your muscles aren't insulin sensitive (like they are after a workout). You want to eat only fibrous veggies (lettuce, broccoli, etc.) with your pre-workout meal(s), where you can eat as many as you want because the fiber will blunt the insulin response (and subsequent fat storage). For your PWO meal, eat big and eat carbs. I'm not sure how many potatoes, but 2-3 small/med sized ones should do the trick. The idea is that PWO you're insulin sensitive, so the carbs won't be stored as fat, but you can spike your leptin levels and lower your body's set point and get leaner as a result. If you eat starchy veg before the workout, it would defeat the purpose of the carb cycling. As for gluconeogenesis, if you don't overload on the carbs (eat some lean protein too - grass fed meat or lean grain fed cuts) then your sugar won't spike much and you'll be back in gluconeogenesis world in no time (i think; i mean, blood sugar usually drops ~1hr after a carb-heavy meal and after a few hours corrects itself, so i'd assume it'd be even less than that for you - gluconeogenesis a few hours later - note: this won't impede amino acid uptake into muscle, just amino acid burning for fuel for a li'l).