There is a gunsmith at C2 Tactical, no personal experience, but its east valley Warner and I10.
I have a bunch of Star Pistols and have a friend that's a gunsmith that has more than me. I will ask him if he has any ideas.
I have a Megastar .45 that had similar issues, i know its a totally different design, but the extractor is similar. The issue i had was the extractor pocket was dirty not allowing the extractor to move freely. After a complete slide disassembly and clean its 100%.
Have you removed the mag disconnect safety from the BM. Maybe try shooting single shots with no mag and see if the issue is still there. Might eliminate a mag issue.
The ejector is fixed in the frame towards the rear of the gun. If its bent, short or otherwise damaged it could add to an issue.
Is the chamber area of the barrel good and clean, maybe take some flitz and a cloth on a cleaning rod and hand polish the chamber and feed ramp a bit.
If you look on line there are a lot of threads about this so there is some common issue.
If you changed the extractor it may need to be hand fitted. I know 1911s, P35's etc cant just change an extractor without fitting. Many parts numrich sells are used so you may have replaced a used extractor with another used extractor. Just brainstorming.