Congratulations, you've found something strange! All of the ultra close-ups I've done have never exhibited this issue. Eovia tech has always been pretty responsive - I'd suggest letting them know your issue and see what they say. It still looks like a geometry issue but if you've welded the point on the figure, I don't know what else to suggest. Please post back when/if you get it figured out. Sorry I couldn't be more helpful... :(