I've been doing way too much research on the forums, and I'm hoping that I can get a few quick opinions on proper sizing. I'm actually 6'2.5 (if that makes any difference), and with a full suit I'm probably around 163 lbs. I'd say I'm in excellent physical condition, so staying out for 3 hours and paddling all over the place isn't an issue. As for skill, somewhere in the gray area between intermediate and advanced. I'm especially confident on late drops, so the shorter size (5'6) isn't as much of an issue in that respect.
I have a a 5'7 groveler now (not a Firewire), but it's really high volume . . . more like a big rectangle. The 5'7 length feels comfortable, but 5'6 just seems like it might be pushing it (just based on my height). The volume on a 5'8 Spitfire is definitely above what the Volume Calculator recommends, but I'm sure that it won't be the end of the world or anything.
Thanks in advance for any insight. Looks like Chito has somewhat similar dimensions and he is charging a 5'6 in well-overhead conditions, so that is good to know!