I use FP4+ and FX-2 in 35mm, but don't know how similar the 4x5 times and results would be. (I bought some 4x5, but haven't had time to shoot it) 11 minutes was too long for me- 9 is about right. I don't get good shadow detail unless I expose at 64-80. The halo effect is usually from gross overexposure, and your reported density is consistant with that. Maybe check shutter speeds, then try a new test with a couple minutes less development. This can be a really nice combination.(posted 8210 days ago)