Really good article about Ektar can be found from http://www.rogerandfrances.com/subsc...tar%20100.html. According to that article and few rolls I have shot I think original shots might have been bit overexposed. I would rate next roll something like ISO 64 and check if results are any better.
Wouldn't that be over-exposing even more? Assuming he shot rated at 100 that is.