Same here, I'm not fat either. I'm using NP XXXLT (euro 56 tall size). I think they have stopped making this size now. I just got the last 2007 Series 5000 drysuit a couple of weeks ago. Solar and Spartan do a good cut XXXL range.
I'm using a C3 Bravo 70 in light stuff, sails are 2005 NS Warps. Boom should really be eye to nose height in light winds, chin height in mid winds and just above shoulder height in high winds (but by then I'm usually on something sleeker, unless I get caught out).