I think you're going to have to play around with plastic temps, holding pressure intervals, and topping off, until you find what works for your mold.
I made a three cavity pop mold for 7" senkos.
I have to shoot it at 315+-, and hold pressure for a ten count, or I get denting. I also have to top off each chamber several times, because it takes a lot of plastic.
I made a three cavity mold because I can only manage three cavities before the plastic gets too cool to shoot. Even then, half the time the third cavity doesn't fill right.
I don't preheat my injector. That might help me keep the plastic hot longer, but I'm just pouring for myself, so getting two baits from each shooting is fine for me.