maximum swell to be surfed on a mal?

I've been surfing for about a year on a McTavish production mal. Here on the Surf Coast of Victoria we just had a fortnight of perfect 6-8 ft swell that I wasn't about to touch with my 9'6" pole. I probably could've zig zagged my way out on some of the point breaks (the beachies were a total walled-up no-go) but the idea of screwing up and pearling on one of those heavy mothers after I tried to take off too far inside gave me the heebs.
So what I'm wondering is, am I just not good enough? Or is there a size of wave where even the most experienced among you put away the mal and pull out the shortboard or else hang out and watch from the beach?
So what I'm wondering is, am I just not good enough? Or is there a size of wave where even the most experienced among you put away the mal and pull out the shortboard or else hang out and watch from the beach?