I keep hearing about the boredom, you might have to really mess with his tank every few days, make puzzles for him, Try the links I put in your other post like the food in a box with a door of some sort for him to open. Use that for like a week every day, then reconfigure it.
Try putting plaid colored panels somewhere for him to blend into, feed him little treats only when he is hiding on the panel... give him live bait once and a while he can hunt, maybe once a week or twice.
he seems incredibly intelligent just from these few weeks you have had him, and from what I have read and seen they seem to be almost the most intelligent creatures on the earth. I bet you can teach him games, almost like tricks and the variants might be enough to keep him entertained. Try different foods to find his favorite, then do things like wiggle 1 finger in an area of the tank. If he comes to investigate feed him a treat of his favorite. Then vary the food, 1 finger wiggling equals the treat, 2 wiggling equals something he isn't as interested, or maybe nothing at all.
Sorry for the long post, if I had the time and ability I'd have a salt water tank, and something like him would be the centerpiece. I'm just thinking of possibilities
<EDIT> BTW he seems to be learning the stick isn't food and goes YOINK and grabs his prize... is once a day enough food? I am thinking about natural predation, and like cats natural hunters are almost always on the lookout for food... I really think you need to let him hunt a bit, be what he really is and feel the satisfaction of getting his quarry.
