I filleted this in the Parasolids Kernel and it seemd to still bunch up in that area. I had several options, which would section the fillet up in different ways, but they all seemed to produce some curvature irregularities in this area. Some of the available tools here also were to dynamically re-tolerance the solid to have the fillet succeed. For instance, here it re-toleranced to .04 to allow a 4 inch fillet.



Note the additional sectioning done in the surface construction, though the analysis still shows the issue:



This one is "maintain Parabolic curves" in the fillet options