I'm an ectomorph/hardgainer etc. trying to gain some mass/muscle.
In other words, I'm 31 years old, fairly strict Paleo since the last 2 years (except for optimizing my omega 3 profile), 5'9" and 143 lb. I'm almost back to my 145 lb pre-Paleo weight, with a significantly improved body composition. I've been doing barbell training and martial arts for the past couple years, but realized I need to take it up a notch, so I started Crossfit recently to improve my technique as well as consistency (still in Fundamentals, haven't started regular class yet).
All the research I've done on Paleohacks/Whole9/Lean Gains etc seems to indicate that I need to significantly increase the amount I eat (and add sweet potatos etc), especially on workout days. Here's my question: if it works, and I pack on another 10-15 lb of muscle, do I need to keep eating like crazy even to maintain the acquired mass gains? I simply don't see heavier buddies eating all the time, so I'm wondering if its just temporary until the mass has been gained, after which I might be able to stabilize at a level where I'm eating more than now, but not the 1 gm protein/ day, 4000 cal/ day level in perpetuity.
Does that also imply that rather than not eating enough I have a gut issue? I did have IBS which was mostly cured by Paleo but flares up mildly from time to time and is not quite eliminated yet. Is IBS/stomach trouble common for hardgainers too, and the real reason for inability to gain mass easily?