Thanks everyone for your comments. My problem is that I really like the PanF+ pulled + Perceptol combination because of the superior fine grain that is achieved but I am have a terrible time with contrast, as in not enough. I am currently working on a series of shot on abandoned farmhouses, so I am indoors with natural light, at 25 ISO, leading to 15-30 second exposure times as a norm. I think I am going to have to follow Thomas' suggestion and determine in a more accurate fashion what it is that will work for my project. I know I could go with a faster film to increase the contrast but I was hoping to do the project all with the same film/developer. That might just be an unrealistic expectation.
Are you correcting for reciprocity failure for those 15-30 sec exposures? If not, you will underexpose and end up with flat negs.