It looks like there is also another problem with these side surfaces too:




If I untrim that surface and look at its structure, it does not come to a clean single point tip, it actually has a tiny edge there that's nearly in line with the edge from the other side:



That looks like it has formed a self intersecting folded-over-itself corner area to that surface - that kind of surface folding over itself in its corner areas will cause a lot of various difficulties, see this previous post for some more description on how that kind of self-intersecting corner region:
http://moi3d.com/forum/index.php?webtag=MOI&msg=1127.4

So those side areas may need to be reconstructed to be better as well.

- Michael