I had the same issue but was using an SJC mount, tried all the tricks. Extended ejector, white plunger, NLC indicator extractor, different springs weights. nothing seemed to work - while using a Lone Wolf slide. Switched to SJC sideways mount and their 10 lbs spring for minor. Gun runs 100%.
I would send it to Carver as suggested. I see both Carver and SJC glocks run well, but most guys are having the pros tune them up.
My open G17
Lone Wolf slide
KKM barrel with SJC 11 port Comp.
13 lbs for Major - 10lbs for minor
Steel rod
Home trigger job
SJC heavy mag well
SJC Cmore sideways mount with thumb rest