Hey, you sound like me - I'm large-framed and the best weight I managed to maintain was 170, at your age I was on a low-carb diet, commuting to work on my bike, running at lunch, kickboxing in the evenings, and doing one long run on the weekend (10 k which is I think 6 miles), on top of that at any given time I'd also be training for a triathlon or other similar event, and still I was, 170 lbs. I'd like to get to 160 this time but really I'm not sure if I can either. I exercise alot too and I'm worried when I get down further it's all going to stop like it did before.
Something I have learned though that could explain the few lbs weight gain is the water-retention the muscles in your body are using to repair themselves. Don't worry about the day to day fluctations. I would pick a day during the week and use that as an official "weigh-in" and I think you'll notice a downward trend.
I also think your calories are low - yes, in fact you do need to eat to lose weight, more than you are if you are exercising so much. You raised your calories but at the same time you raised your activity level. Consider upping your calories, at least on your exercise days. Just my two cents