Those colors look great, when they dry, i found using a pec pad and rubbing hard cleans em off good. Dropped a fresh one on the ground and fixed it that way.
I've been using my EE100, colorpack II and hassy polaback without issue with FP100C. Maybe the 250 is differrent though, i haven't lost a shot yet. I thought i did due to misexposure, until i found out how to reclaim the negatives (which I saved all of them) WOOHOO!