I say go for a little more testing.. release them asap though, once you have a pretty good idea that a new design works..
What tank sizes is it going to be available in? I think you should make 45,68,and 88ci.. I like the 68ci myself, the 3k 68s were PERFECT for me, but some people like smaller, some bigger.. personally- not IF, but WHEN i get one.. i'm going to have to take a hard hard look at 45s.