Are you measuring each case before you neck size? Is it a "neck size only" die? I always use a decapper first, then adjust neck tension through other means.
You will have too much neck tension if you don't expand the interior in some manner. You could buy K&M's, Sinclair Internationals or another manufacturer's expander mandrels. The apply the expanding pressure in a downward motion as opposed to pulling it up through the case neck. They also apply the pressure to the full length of the neck, as opposed to drawing a small ball through it.
I use the "NT" or neck turn mandrels. They are .002" smaller than bullet diameter, this usually gives .003" neck tension when the brass springs back. More than enough to hold a bullet without a crimp.
Lubing the interior of the case necks should be helping, the major problem is most dies (except bushing style) oversize the crap out of the necks. You can measure the diameter of the expander buuton, .307" to .306" is usually a good measurement. If you lube the interior of the case necks, tumble them clean again before priming.