well right now I am eating about 1500 and burning more than that... obviously that will change on a ph...
DUDE!!!!!!!!!!! Need I say more?
You are on a low calorie diet, AND you burn a huge amount of calories! I can guaran-freakin-tee you, that if you up your calories to about 3000 you WILL gain weight, without PH. How in the heck will you gain fat with that amount of calories?
That said, you should reconsider the amount of endurance activities if you are serious about getting bigger, at least temporarily. Just cut back on the exercises and eat like a horse. Your body is literally starving, please don't worry about gaining fat!
Get some quality food, and buy some dextrose/maltodextrin and whey for a homemade post workout shake. Tell you what: put the prohormones on hold, take my advice try to consume around 3000 cals daily, cut back on the cardio and come thank me after a month when you have gained weight! Better yet, try it all to way through wintertime!