Sorry for necromancing but I realized it.'s a good place for this, relevant to class and all.
There's an issue regarding AC and Attack roll penalties past colossal. In some cases, such as the most obvious combo I utilize, by taking 7 levels of a giant class and all of titanic, hell even just 5 of titanic, you can reach size category of Colossal++++, what's the problem? In your FAQ you said penalties to AC and Attack roll past colossal increase by 4 for each size past colossal. So at C++++ it is at -26 to AC and Attack Roll. Basically making impossible to use with any regular attack, and as I mentioned in Chaos template thread, some abilities utilize Attack roll as DC or just for its effects, but even if they get bonus effects for being bigger, DC actually becomes lower. That really penalized any concept that focuses on Size. Even if you pick overwhelm, that's a +1 increase to DC and some stuff per size categories. Doesn't offset it.
It's an issue I noticed in some cases, as the stat increases don't really keep up. Most D&D monsters utilized the bonus strength from size increase which at Gargantuan already is +24. And the particularly big monsters had a lot of HD, offsetting its penalties to attack. Can't something be done to make attacking with weapon or such at big sizes viable?