Measure the diameter of your cases just north of the extractor groove in the web area of the case and compare the dimensions at this area with:
1. Your virgin brass
2. Your once fired "normal" velocity loads
3. Your once fired "hot" velocity loads
4. Your twice fired "hot" velocity loads
5. Your fired brass after resizing
You may be expanding the web area of the case, and your die isn't reducing the diameter sufficiently below the chamber diameter.
This will cause your feeding/extracting to feel sticky as well.
If this is the case, screwing your die further down against the shellholder will not fix your issue, but only serve to increase headspace, and potentially lead to case head separation.
You might look at "cooler" loads, and see if they are expanding the web diameter as much....