I've installed over 200 post units. The key to setting the post so that it does not move, before the concrete completely hardens has to do with two factors.
First, the hole must be narrow. For a 1-5/8" pole, I use a Seymour 4" Iwan earth auger to drill the hole into the ground without distrubing the smooth sides of the hole. Forget the standard post hole digger. The hole is too rough and uneven. I use a 1-5/8" muffler clamp to keep the pole from turning.
Second, the concrete must be mixed very dry. The drier the concrete mix; the stronger the concrete is. Pack the concrete around the post and tamp it down with a sledge hammer around the post until it is plumbed with the level.
For customer installs, I use the chain link fence line post. I've dug these up after 9-10 months and they will already be showing rust at some contact point with the concrete. So, for my own personal installs and for installs for my friends and those who care, I use aluminum pipe or tubing. I've used stainless steel before, but it was too expensive. Aluminum pipe is fine, since it's wall is over 1/8" THICK and will last for at least 50 YEARS. I know this for a fact, becasue while hunting with a metal detector, even aluminum foil is intact after 30 years in the ground, while steel "tin" cans are almost totally gone. Even thin shell aluminum airplanes downed in the Pacific are in rather good shape after years of salt water immersion.
I am sure, also that an adaptor can easily be made for the smaller SuperDish from a length of 2" OD steel tubing a tap and a few bolts. This would easily clamp on the standard 1-5/8" pole. If made of schedule 40 pipe, the post will easily support the 2" SuperDish, since relatively thin tubing successfully supports the current Dish500.