I like the idea of overhead squats, but front squats may be a better alternative. They're just easier to learn. But hey, a challenge is a great thing, and I loved overheads when I tried 'em out. It's humbling, I'll say that much.
24 lbs. in three months? 8 lbs. a month? 2 lbs. a week? Shame, you know to aim for 1 lb. per week my friend. I'm guessing you added a bit of fat, yea? I kid, I kid. At least you put the weight on. I was downing 4,000+ calories back in March 2005 and I didn't gain anything. My job is labor intensive, coupled with my adolesence and other activities. Any idea how much of what you gained was muscle?