What would be a good weight training routine to reach my goals?

Anonymous
So, some background information about me first. I've been overweight since I was a kid, in the past, all of my diet and exercise plans have failed. Back in late May, I finally found a diet and exercise plan that works for me. I've lost 35 pounds since then. I'm down to 300 lbs. now. I'm 6'3" and have a fairly large build. My goal is to hit 200 lbs. with a decent amount of muscle. So to that end, I'm trying to weight train while losing weight, so that I'll already be fairly muscular by the time I reach my goal, as well as to increase basal metabolic rate through increased muscle mass in order to help get past plateaus while losing weight.

My current weight training plan does seem to work, somewhat, but not as well as I'd like. My muscles feel toned, and they're a little bigger, but I was expecting more size after 2 months. I only have dumbells with 40 pounds of weight. Right now I do concentration curls for biceps, vertical french extensions for triceps, shoulder flys for deltoids, chest flys and push-ups for pectorals, sit-ups and crunches (with and without rotation) for abdominals, and squats and lunges for the quads, glutes, and hamstrings.

I start out at 80% of my one rep max, do reps until I can't anymore, drop a percentage of weight, and repeat the process for 3-4 sets. For squats and lunges I use only body weight for resistance since I'm 100 lbs. overweight (my legs are already my most muscular area from carrying around extra weight and genetics, so I'm mostly just toning, so I guess I should hold my dumbbells while doing them). I do my whole routine on one day instead of staggering muscle groups because it's easier to keep track of what to do. I take 3 days off for rest between routines (what my gym teachers used to recommend when weightlifting in high school). I try to eat a lot of protein, but I can only eat but so much since I'm on a diet.

Any tips or comments on my routine?
Updates
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By the way. I don't just want muscle size and strength, I also want more speed and power, because I'm considering getting into Mixed Martial Arts once I get in shape.
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So, I was doing some research and it seems likely that I'm simply not getting enough protein while on my weight loss diet. I'm reading that you need 1.5-2 grams of protein per kilogram of bodyweight, which would be 204-272 grams of protein at my current weight. I'm only getting about 60 grams on average on a 1500 calorie diet. Any recommendations for high protein, low calorie foods?
What would be a good weight training routine to reach my goals?
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