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I would try to buy some material bar stock and place it in the center of the cavity and over mold it this would help you cycle time also as it does reheat the the plastic to bond and does help to...

I also have experience this . Most times it is pellets stuck to the screw . instead of force feeding try to clip some runners about the size of one flight of the screw and feed the down the screw...

I would say looking at the image that this is more of a heat check issue than a true flow line this happen when the surface of the tool gets to hot . Are the core steel ? how hot does the surface...

try elvaloy ac looks to have the same gloss and flexibility if you smell the part and it smells like a fishing lure that is what it is . my second guess would be a ldpe