Well, I've been working with filleting for a while now, but have never come across this problem until now. I have a flat surface and am trying to make a smooth curve inward using a lofted surface I created. I fillet, then trim the flat surface and the lofted surface which gives me what you see in the image below. The problem is that you can see the seams.

I have tried increasing the tesselation of both surfaces to highest quality with 5 divisions, made sure smoothness was at 3 (highest), altered the tolarence for both the trim attribute and the fillet attribute for the respective surfaces, increasing the number of isoparms for both surfaces, decreasing the number of isoparms for both surfaces, but none of these things work.

What on earth do I do to fix this? Seeable seams are circled in red. The arrow points to the most visible seam area.