barrel length vs gas block location vs port size

[txjm]

I am trying to get a 6x223 running. I know it isn't a 300W but everyone was so much help on my whisper project, I thought I would check in here for answers.
My upper consists of an 18" barrel with the gas block in the carbine position with a .067" port. The caliber is 6x223 or 6x45. I am having problems with the fired cases ejecting. The extractor is jumping over the rim and the bolt is picking up the next case and jamming against the back of the fired case that is in the chamber. I am trying H335 with an 85G SGK. The loads varied from start load to max load(Lee Reloading Manual). All loads had the same issues. I did get a few out of about 15 rounds to eject and pick up the next round properly. The fired cases ejected easily (some of the max loads were a little sticky). The velocity is a little lower than the book values for the min and max loads.
When I chambered the barrel and was playing around with dummy rounds with the ejector removed the extractor seemed easy to snap over the case. Yesterday I compared to another bolt and the other bolt is a little harder to snap over the rim of a case in the chamber.
When I loaded these rounds I worked with the shoulder to rim lenght to minimize headspace. The rounds would chamber out of the mag no problem.
Everything works fine manually.
Where do I go from here? should I have gone with the rifle length port location even though I wanted the block under the handguard? Is my port too large? Is my extractor bad? Is my extractor spring bad? Is my rim to datum case length too long?
Chip