Originally Posted by mew
Aren't you supposed to skim off the hot break rather than letting it boil back into the wort?
This is a whole separate topic, and you'll probably find much debate surrounding it. In short, skimming can't hurt, but it also won't remove all of the break material. There are some cases where it's nearly impossible to skim at all (first wort hopping, for instance). If you'd like more opinions on skimming the foam created during the formation of the hot break, I suggest starting another thread.
To the OP - I routinely boil at nearly the maximum capacity of my brew kettle without incident. You just have to watch carefully until the first sign of a boilover. Once you control the initial foaming (usually associated with hot break formation), you can relax a little more.