I absolutely don't think you are a bad cat meowmie! I think you've weighed all the factors involved and are doing the very best that you can for Sunny. Each and every case is unique. Only you know all the different factors and none of us are in any position to judge you for whatever decision you make. (Not that I feel that anyone has judged you at all!) I know it was so frustrating for me trying to get Morgan to eat the Transfer Factor, and it had no positive results in my case. I'm very glad for those that it has worked for.
KAK and I discussed it, and I'm sending the unused Transfer Factor to a friend of mine in North Carolina. She found out last week that her 3 year old Basset Hound has lymphoma. He's going to go through treatments that have an 80% chance of remission, but they still don't think he'll have more than a couple of years. So in addition to the the treatment, she's going to try the Transfer Factor and hopefully get more time with her Wilson.