For the pole, the best bet is to use a baffle of some sort. All of the baffles should be "wobbly", so that if they get a grip on one edge somehow, it falls down, allowing the squirrel to drop instead of continuing to climb. Avoid plastic baffles, and use metal ones. Plastic ones can be chewed...squirrels have incredible teeth. And even if they don't chew through the baffle, they can scuff it up enough to get a better grip for climbing. The best type of baffles are the ones that are more like a can than a saucer. The squirrels climb up inside, find the way blocked, and back down. If they try to go on the outside of the can, it pivots and they slip off.
You have tried them all! Each one claims to be squirrel-proof, but you have pictures to prove they just don't work. Does a squirrel-proof feeder really exist? How much does it cost? These are the usual questions we get involving a customer's decision to purchase a bird feeder.