I think GD is right on track, forget the numbers, find what fits you best and where you shoot the best, and leave it there. Both my Onzas draw long, so I just have them set where I like them, and shoot. When you measure your own draw length (27), are you just going by the modules, or by actual measuring? Could be you have the mods set at 27, but the bow draws an actual 29. Either way, just shoot it set at however you shoot best, and enjoy it.
2006 Rytera Bullet X 60#---2008 Moab 70#
2008/12 Firecat 60#--- 2010 Warthog 70#
2010/2012 Alien X 65# 2011 Onzas 60 & 70#
2009 Warthog 70#---2009 Firehawk 70#
2010 Strother SR-71 65# & 2012 Strother Rush 65#
I hunt, therefore I eat. lol