An update for everyone:

He finally took a rat! He refused it last week, but I offered again today. I was going to yesterday, but I had to take him out to work on his bedding so I gave him that day to settle down. I set the rat out, and when I opened his tub I bent down and saw his little nose at the entrance, just hovering there. I waved the rat in front of him, and he struck so hard that the front of the hide jumped up in the air. He didn't grab the rat, but managed to knock it onto the bedding. I picked it back up waved it again, just in case it was just a failed strike and not a fear response. This time, his aim was true and he tore the rat from the tweezers and drug it into his hide. I was grinning from ear to ear. This was the end of his 13th week on strike, so fingers crossed he'll repeat this next time!

Is a small rat every two weeks ok, or should I go back to my original medium rat every two weeks? The small rats are about half his girth, and the mediums are roughly as big around as his widest part. I figure weekly would be too often, especially since he's gone a good amount of time without food?