I've got it in the middle now and it shoots great. It's 4 cavities, slightly larger spru / runner, and shoots great without topping off.
If you use super soft and inject at 380 degrees, you may have to top off. Personally, I like the action with regular vs. super soft on this bait. Either way you will be fine as long as your injection temps don't get out of control (much over 350), if they do, topping it off will still give you perfect baits.
Thanks for the input.
Jason