Most zoom lenses have a sweet spot. Your lens movement might be the auto focus, make sure it is switched off on both camera and lens. I'm sure Mike told you about the focus trick, I use a strip of newspaper because it has different type sizes and can be wrapped around to fit different surfaces so I have a better idea of depth of field.
You will have to move the camera and tri-pod back and forth with the 60, but it is an absolute honey for clarity and sharpness. Will do everything from in-your-face to full-length, about 10 feet back. (My favorite since I retired the 210 Rodenstock on my 4x5.)
With Photoshop you can get into altering contrast, sharpness, brightness and innumerable other things. I use these on occation, but I still like to rely on photography skills. You will need to learn to crop and size, and save archived stuff in TIFF, low-rez in JPG for posting, there simply is no end....
Best,
Steve
(BTW: the Hepburn is sold!)