argh. what length do girls really ski?

So, I'm mainly skiing a pair of 2010 Volkl Kiku 178s (for chilled out surfy days), and a pair of 2010 4FRNT EHP 179s (for a bit more speed and a more aggressive line).  Both are feeling too short these days, and I'm definitely in need of some more float on the bigger snow days to have more of a chance of keeping up with Jan on his Praxis powder boards.  Wishful thinking on both fronts (keeping up and having a bigger snow day), but it's nice to dream.

Trying to work out whether something like the PM Gear Bro 192s are way too much, or just right for bigger snow days.  Loving the weight on them.  Unfortunately, the only help I can get is from size charts like this which declare that as an "expert" I should be skiing a 170.  Give me a break.  It'd be lovely to know what the competent girls out there are skiing these days.  Tried to figure out what the female comp freeskiers around my size are on to find a reasonable maximum, but I haven't managed yet.  186s seem like a no-brainer in general, but over 190 starts to look a little less obvious.