Short effective edge? Carving boards have long effective edges.
This really depends on the board. For example, at your weight if your talk to Prior, they probably would want you on the 174 or the 179 rather than their 169. But you could get them to do a little custom on the 169 and stiffen it up for your weight. OTOH if you're planning on a lot of bumps, you might want to go with the stock 169, intentionally having it a little softer than ideal for carving for better bump performance. I was on one of their older 165s and it worked real well in the bumps, but it was a mite soft on the groom.
If you go with Coiler then Bruce would make it right for your weight regardless of length but then again there's that 1 year wait. Sean over at Donek can build an Axis to suit, too, I bet.
I'm a little heavier than you (190) and I'm on a Coiler AM172, and I don't find the length an issue at all. Lots of guys here ride really long boards but if you want to be in the bumps you probably want to stay under 180, and maybe more towards 170.
Rambling now, hope that was helpful.