First, be SURE the extractor is good.
Make sure it has sufficient tension, and the extractor is undamaged or worn, and has a good grip on the case rim.
Many if not most of these types of problems are often the extractor not the ejector.
Second, I'm not failure with the newer Star pistols, but by any chance does the ejector assembly play any part with the magazine safety?
If so, put the parts back in and test fire again.
Third try ANOTHER brand of ammo. Testing a problem gun with reloaded ammo is a very poor choice. Reloads often cause problems, and you have no idea whether it's the ammo or the gun.
Try some quality ammo, and for testing, forget the cheap stuff and the reloads.
Next, make sure the chamber is good. No rust, pitting, machine marks, or bulges or rings.
Make SURE it's clean. Easy to assume but can cause big problems.
Make sure the recoil spring is the correct one, and not an "extra power" or one from an entirely different gun.
Parts can be bought from Gun Parts, although you'll probably have to buy the parts under another model name.
http://www.e-gunparts.com/model.asp?idDept=238
Jack First should have a new ejector, but you have to actually call.
http://www.jackfirstgun.com/
Only after you've thoroughly exhausted all other checks should you start playing with the ejector.
A damaged or too short ejector can usually be spotted with no trouble.
Simply pull the slide back and LOOK to see if enough of the ejector is showing.