Pete, I have had the same problem with the hi-highlights before. Lately, I've used titanium white very little in my fleshtones. When I do, it's for the application you describe. Try this; instead of adding the white to your highlight color, use it straight. Apply it s p a r i n g l y, blending as you apply. Then leave it alone. If you only add it to the highest, most reflective points of the face it shouldn't need alot of blending.