I hear you. Well, I guess I'll just have to experiment then. I'd like to use up the FP4+ before standardizing on Tri-X, so I'll test a roll and then not be surprised if I find I have to push the FP4+. I have a couple rolls of Fuji 400HG to test also. Can't wait for the Holga to get here. The order confirmation message said it might be 10-14 days due to a back log.
If you want to use slower film, I think Randy will modify the apertures to give you two wider ones than are standard with the camera. If that's an important consideration you might try to contact him.