Hi Tracy,
Kaleb is a stunner - He looks like a lovely F2. I love his wild face and his markings and colouring.
I have an F2 boy who drove me a little nuts for a while with inappropriate pooing. I talk about it at length in his thread.
http://www.bengalcatforums.com/forums/v ... light=zion
I found the only answer was to pretty much fill my house with trays and put my life on hold so I could watch over him and put him in the nearest tray whenever he looked like he wanted to poo. Eventually It built the association with the tray back up. Also I realised that a lot of the time his inappropriate pooing was in response to something he didn't like, so I had to work all these things out and change everything to suit him. Even then it was hard work, and went from pooing inappropriately a lot of the time to once every so often, but I had him neutered early (at just over 4 months) and the last time he ever pooed inappropriately was the day after neutering. I'm pretty confident that the loss of his sexual hormones was what finally brought this behaviour to and end in his case.
Like Miki has suggested, confining him to a room may help, but I think you still need to be prepared to watch over him and put him in the tray at the first sign that he might want to go. It may mean quite a few days off work, and quite a few pretty sleepless nights until you can really establish the habit of the tray being the place to go.
Feliway plugins may help, but there doesn't seem to be any conclusive proof that they are effective in all cases. However I used them anyway, but I think essentially it was making the effort that made the difference.
Others may have more experience and advice, but that was what worked for me.
Have you contacted his breeder for some tips?