So I've hit 180 lbs a bit faster than I expected to. I wasn't perfect with my eating, but it was more 50/50 slightly above and slightly below target calories depending on the day. My weight gain has definitely slowed now that I'm up 10 lbs, but the fast upward swing of the first few weeks had me concerned. I'm guessing it has more to do with my massive increase in liquid intake with protein shakes rather than me suddenly getting fat out of nowhere.
Is this normal?
Aside from that, my increases in lifting ability are very quickly outpacing the rate of my weight gain, just like you said it would. Also I've gotten many compliments on my increased muscle size.