dude, it's not too big. Your including the base, the base is 2in thick, so you have to subtract that from the overall height. He's not standing up completely straight, but even if he was, it would make the statue itself an 1in taller at most. If you take the statue at 23in, multiply it by 4, you get 92in=7.6ft at most. There's no exact measuement of Hall in the suit, but most would say he was 7.5-7.7 while in the suit.
Even if you diagree with how much taller the statue would be if he was straight up, the scale would be barely bigger then 1/4, not even enough to make a big difference next to other 1/4 scale pieces. These statues are never going to be completely 100% 1/4 scale to a tee.