When in doubt go back to basics…
Take some time off, stay away from the weight room. Don’t read T-Nation. Don’t watch 300. Stay out of Sport Chalet. Don’t drink a protein shake. Don’t count your calories. Just detox from the weight room for a week.
Now when you’re ready to lift again change shit up to a very basic plan just 2, MAYBE 3 days a week, low rep, 3-5x3-8 reps just kick back and basically deload, and slowly (every week or 2) add in some more stuff. Meanwhile you can work on prehabbing any injuries and increase your time spent on actual combat.
Just a 4 week cycle of this would be fine.
Stay away from the curls, you’re building up a shitload of volume on our elbows already from MMA, very much less pullups, rows, curls, extensions, presses, etc… You have to eliminate all the unnecessary shit so that you can have higher quality actual combat sessions. The LESS work you do in the weight room, the MORE you can recover from training.
WHATEVER training system you use (531, westside, crossfit, etc) you need to be keeping track of are a couple indicator lifts that are working the athletic attributes that you want to improve (leg strength= squat, pull strength= weighted Chinups) and make sure that you’re improving them EVERY microcycle. After 4 weeks there’s no reason you can’t put 5lbs on your upperbody lifts and 10lbs on your lowerbody lifts… Also whatever indicators for the energy systems you’re training as well (Rounds of bagwork or circuits) should be attuned specifically to the time frame of the event your training for (3x5min rounds, or a 5round fight, or 3min rounds like in muay thai) but just keep track of something. You can get as detailed as you want (counting punch/kick volume by videotaping your bagwork sessions) just make sure that you are keeping track and PROGRESSIVELY improving.
As far as choosing assistance exercises… this is probably incorrect somehow but the analogy helps me- think of the exercises like prehab or ‘activation’ exercises. So like for glute activation exercises you’re doing your best to tense the muscle as hard as possible and activate as many fibers as you can so that you’re starting to recruit your glutes in all your movements instead of them being shut down by stronger muscle groups… In my mind assistance exercises are exactly the same except used just progressed farther along, so these are the weighted versions basically. So if I’m doing dumbbell presses I need to be HYPERAWARE of my muscle groups and tensing whatever I want to be activating and CONSCIOUSLY applying as much force as possible not just walking through the movement. Don’t just throw up the weight, pay close attention to your form and getting as much tension out of the muscle groups as you can while applying maximal force & velocity to the bar/implement. With this mindset when you train your CNS during your maximal lifts you’ll be recruiting more muscle fibers and (if your diet is good) have muscle fibers with larger cross sectional area.
As far as your diet, it sounds like you need WAY more carbs and a hell of a lot more calories. Especially if you’re attempting to gain weight. You probably don’t realize how many calories you’re actually burning through a day. Keep track of what you normally eat as much as possible and just keep adding 3500 calories per week (500 calories a day) till you start to gain a lb a week. You can then balance your diet by a couple hundred calories a day as long as you know your equilibrium. I eat like Dan John preaches, meat leaves and berries. As close to a caveman as possible. I have a thing for chocolate milk so that’s my only ‘sin’ but otherwise I get all my carbs from veggies and fruit. I actually make a lot of vegan/raw food type meals. Use a vitamix blender and make soups, juices, etc.
The reason I eat this way is because what not a lot of people talk about is that if you train multiple times a day then you usually don’t want to eat after training really hard or you’re about to train again so you don’t want a full stomach. Then you end up in a caloric deficit, or not energized for training sessions. Raw food diet, I end up getting a ton of carbs from juices, shakes, and stuff plus all the good part of veggies & fruit (antioxidants, vitamins, etc) but it’s also really easy on my stomach so I don’t feel bloated or stuffed or anything.