You don't say how old your materials are, but I've had subtle quality problems with paper that's even 1-2 years old. Now I try to buy in smaller quantities and more often. Do a complete end-to-end check of your process- thermometers, enlarger illumination and alignment, cleanliness of lenses, light leaks, the works! Email me if you'd like a writeup on the subject. Personally, I'd start out with some HP-5+ or FP-4+ and something like D-76, though HC-110 dil B should be fine too.(posted 8511 days ago)