Just a quick update...
Unfortunately, shooting at cooler temps (~310) didn't really help. I still got a lot of denting on the bulbous parts of the claws. Lamar's tip did help a bit (topping up the sprue with warmer plastic from the Pyrex cup instead of the injector) but the mold is just too much of a pain in the rear, so I've given up on it. I have a BTS craw that works well, and I'll just stick with that for now.
Thanks to all for the tips/help, I really appreciate it.