Andy,
Welcome to the club.
Now you have your IR converted D100 I can reference some of my experiments from your pics if you give some details, paricularly WB setting. It would also be very helpful to post an unprocessed pic to reference that info.
Now we actually have some sun, I will be able to compare a double thickness film filter with Hoya or Cokin IR filter as they both have the same cut-off. Still not sure at what wavelength the film filter cuts off.
Don