G' morning! I'm pretty sure everything is tight. I always use the self timer to trigger the shutter on a 2-4 second delay; since it's all electronic, I doubt vibration is an issue.
The aperature is an issue, though. The lens only stops down to f8, a major limitation, though that's the aperature I always use. A trade off in focus location may help, though...thanks for that! Perhaps I can experiment with bending the neg slightly to accomodate focus; no wait... I get a good, square rectangle around the edges now, curving the neg will mess that up.