Looking good, Lord, looking good.
I understand your desire to gain more size and get to 270-280's. I would encourage you, however, to keep in mind that there are often (usually, I believe) sacrifices that are made when carrying THAT MUCH body weight around. Sacrifices to your overall health. Sacrifices to how your joints feel. Sacrifices to your quality of sleep. Sacrifices to your cardiovascular health. Sacrifices to your overall quality of life. And so on.
Hell, it becomes difficult to find clothes that fit well. Your chances of having Sleep Apnea increase dramatically. Even little things like it becomes difficult to fit on rides at Disney World.
I know that most of us (myself included) tend to minimize the negatives of living this lifestyle, and like to pretend like carrying as much extra mass as possible really isn't THAT much of a hindrance to our health and quality of life. But IME and those of pretty much every guy I know IRL, the negative impact and consequences are something that should be considered.
For the guys who are 260+ who disagree, I get it. I believe that they really do think I am wrong. But it is my belief that they just don't REALLY remember how they felt at 235-255 lbs, when comparing how they feel now.
Not trying to discourage you from pursuing your goals. Not really expecting this to make a difference at all. Just throwing out some things you may not have had to consider yet, from someone who has lived it.
Good luck in your pursuits, buddy!