Sam, if you are producing lures, you really have to just get the ST76. It's the only way to judge how they feel and look on a lure. Weight and specs can only tell you so much.
Thanks for all the reply's guys,
Brandon, I just had a look and found I had some ST76 4/0's, definitely a different hook when compared to the ST66... Kinda makes the ST66 look "skinny" although I have no issues with the ST66 as they serve me well...
I need to get in some ST76 5/0's and test them out, I used some ST76 4/0's on a new stick bait yesterday, swam good but did look different with the "heavy duty" hooks, not a big deal more so what I'm use to looking at.
I need the big treble for a popper that runs just the treble on the belly, but I still need to try a "baker" on the belly too as I have a thing for single hooks