I use the Ilford PQ Universal for LF negs -- especially FP4+. From dilutions of 1 to 9 up to 1 to 19, depending on the brightness range of the scene. Looking for negatives with a DR of around 2.5 to 2.8 for carbon printing. I take the 5 liter bottle and split it up into 5 one-liter bottles.
Ran out the other day and went to grab a bottle of D-76 (I used it straight...1 to 0...70F for 10 minutes). After pouring it out of the Expert Drum (3005), I noticed that it was more yellow than normal. It was actually a bottle of Dektol. Negatives were beautiful...so I have been using Dektol until I get around to buying some more Ilford PQ. Developed a few 11x14 negs and several 8x10's lately and I think they'll print fine. The couple sheets of Rollei Ortho25 have an impressive DR considering the brightness range of the original scene.
Girders, Golden Gate Bridge
4"x10", 300mm lens
Scanned carbon print
FP4+ developed in straight Dektol, 70F for 10 minutes
Scene had a range about 3 stops (9 to 12 on my Pentax spot meter)
Slightly less contrast than I normally like for carbon printing, but I upped the contrast by reducing the dichromate concentration