Well just me being on AR should give you a clue as to what I might do, I'm currently on a lifting program specifically for hard gainers, I just started it, im actually comming off sitting on my ass for 2 months so ill let you guys now how its working.
I know metabolism is part of your genetics, but your metabolism can be changed by your diet or just getting older. Your genetic code is your genetic code, overall that cant be changed. Dont worry, no bubble bursted Foreverblast.lol.