Alright, after trying a 3.5Ω at 5.6v's (8.96watts), a 2.5Ω at 5v's (10watts), and a 1.8Ω at 4.2-.25v's (10watts)
(all were IKV io6's) I can safely say that the 1.8Ω vape at ~4.2-4.25v's is my favorite. Some folks will say that it pointless to use a VV mod for a "lr" atty at a low voltage...BUT...