In his posts on this thread Vaughn has given some very good advice, especially concerning what to do after attending a workshop. Workshops are intended to give newcomers to a particular process a place to begin, not a place to end. Water quality, relative humidity, temperature, UV source, and many other things alter final prints.
Also I would add that "Haste makes waste". An old adage yes, but a most valid one. At one point the originator of this thread indicated having four prints in various stages of exposure and processing simultaneously. One at a time from beginning to wash helps to assure more consistent work. I had a student whom I frequently caught with 3 or 4 prints in developer trays in the school darkroom. His printing, in fact his photography in general, showed little or no progress from his first class to his last. This began over 10 years ago, and his printing skills still show little if any improvement.
Slow down, think, keep notes and your problems will become fewer.