Since I have never used Foma 100, what I am writing here is backseat driving, but here goes...
With Foma 100 and a single coated or uncoated lens, maybe you need to cut exposure a small amount and boost development quite a bit, or even to use a more energetic developer up to and including D-19 or similar. I would be a bit surprised if one could not coax more zip out of a continuous tone film. Would love to hear more from those who have actual experience with it.