>>12830
I feel a little bad that nobody else has chimed in, so I'll give this a go.
Disclaimers: I am not personally a gainer or a fat guy, just a fantasizer who's been in this space for a while. I don't know you, I don't know what you've been trying, so forgive me if the following tips are obvious or things you've already tried.
First: I really don't think you should beat yourself up about your current situation. I have a definite sort of admiration and respect for people who are bold enough to follow through on their fantasies. You've already done an incredible thing to reach your current size; I'm about 200 pounds and on the tall side for a guy, and you're literally about twice as big as me. That's a genuine mindfuck if you really roll it around in your brain. You should be proud of what you've accomplished so far!
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But on to the matter at hand: you want to go further, and you're frustrated by what you think is a small appetite. These issues are linked, but not closely.
So, big binges are fun (I can do some damage on a cheat day), and stuffings will certainly grow your waistline. But all the fattest people around share one trait: they're grazers. Snackers. Some supersized people can definitely house a family-sized dinner, but a lot of them actually can't. So: try to keep snacks around within easy reach as much as you can. It's very easy to nibble your way through say, a whole bag of potato chips while watching TV or playing some games. Junk food is literally designed to be easy to eat, and is calorie-dense to boot.
Source: a bunch of half-remembered stuffing and fatchat vids from over the years, plus some half-remembered appetite studies.
Next: liquid calories. Like junk food, your body doesn't properly "register" the caloric value of of things like soda or alcohol. Think about eating a whole pound of bacon. If we're being honest, you're probably a little queasy at the notion (even if you'd want to try). A pound of milk is just a pint (or about a half-liter); anybody with a healthy digestive tract can crush that without a second thought. Gain-shakes are a tried and true staple for a reason, but on a less extreme note, "topping off" after a meal with a caloric drink is a good way to "fill in the cracks" so to speak, and to gently push your limits a bit.
You probably knew this was coming, but: pot. If you can easily access the green stuff in some form and can responsibly use it, it's almost certain to boost your appetite (it does make some people nauseous though, hopefully that's not you). I'm still undecided whether or not it "loosens" my limits personally (I'll get baked once in a while), but the munchies are absolutely a real thing and food tastes real good when you're properly elevated. If I indulged much more regularly, I'm sure I'd be huge.
Maybe a bit of a reach, but if you have any fat friends, consider making an effort to hang out with them more. Fat absolutely is contagious. Do with this what you will- I'm sure you don't need a normal-sized guy to opine about the social dynamics and perception of fat people.
As far as stimulating appetite more directly and building capacity, I'm a little less well-equipped tbh. I personally would advise against getting chemicals/medicines involved that aren't properly prescribed or "common" recreational stuff. YMMV but that's my take. If you're patient you could try applying some tricks that competitive eaters use to build their capacity: eating tons of bulky foods like vegetables to acclimate to the feeling of extreme fullness and to stretch out the stomach. You can chug water too, but you really should mix in a bit of salt or gatorade powder; it's deceptively easy to flush out your electrolytes too much.
One other thing that's obvious enough to potentially skip over: consider counting calories. I can hear the groans already but I'm serious. You're basically engaging in a form of bodybuilding, so that means you need a time-average calorie surplus. If you're really running into a wall, then having some data to work with might actually help you find some insight. Then again I'm a huge nerd so I'm gonna default to wanting data. As with everything else YMMV.
Lastly, this might be a coincidence (I'm still not an expert on how chanboards work), but if you're the same id as posted earlier in the thread (back in Feb or so)- have you talked about this with your wife? I'm sure she'd be able to do a hell of a lot more than some random jerkoff on the internet like me.
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tl;dr
Snacks
Liquid Calories
Pot
Fat Friends
Bloat Training
Calorie Counting
Involve S/O (if applicable)