Too Tight
I thought hard about changing the whole cap and paintsaver out but didn't want the hassle right now, (drain tank, heat the epoxy). That is ultimately the way to go.
There are custom caps built to fit but they are pricey (+$200). I tried vaseline, I tried sanding, I called Landmark for a replacement (no help). I called a dealer (backordered). I finally bought a Landmark cap and paintsaver set (Bandit I think they call it) for $50 and pitched the paintsaver.
Its fine for now.