Endura sizing

Just tried on an Endura Singletrack jacket and find myself between a Medium and Large size. I’m 5.10 13.5 stone (well I was prior to the Christmas gorging) and found the M a bit snug and very close to being restrictive, but the L felt like it’d become a sail in the wind. Am I being picky? Has anyone else had similar sizing issues with Endura jackets? Does anyone have any recommendations of similar jackets – i.e a mid weight water proof with a hood, around £100-£150 and ideally not black or luminous yellow?

http://singletrackworld.com/forum/topic/where-can-i-buy-an-endura-tape-measure

ha so I’m not alone!