IMHO- that is quite a lot of calories for only a few weeks post OP. Maybe cut out the "salad" part and just have tuna or eggs by themselves. I don't really count calories- just protein and carbs, but my usual calorie intake at 3 months post OP is between 600-800 per day. You are doing awesome on the protein intake! I average between 70-90 per day of protein. Good luck!
Unfortunately yes, but for me it's only after I'm done eating. So I try to go for a walk after lunch as to not surprise anyone with my noisy sleeve. Usually stops after 10-15 minutes. I'm almost 3 months post op.
Try changing your diet habits or exercise routine. Maybe your body is now so used to what you've been eating or doing, and it needs a change. It might just be the kickstart you need! Good luck! And congrats on the 50 lbs down! That's awesome!