Is your problem one of focus, or camera motion? The type of unsharpness is quite different. Motion will give double or smeared edges, almost always in one direction. Poor focus will give a general diffuse image, but something, either in the backgroud or foreground will usually be sharp.
Originally Posted by RattyMouse
A thirtieth is on the slow side; it's certainly doable with practice and good technique but I'd use a tripod at that speed if I wanted to be sure of good negatives. I try to stay in the 1/125 and up range, and that's with any camera handheld.