They don't ALL go that fast... some go faster.
In front of each station, inside the bunker, will be three machines. One will be set up to throw a left, one a straight (sort of, there's a certain degree of leniency in the word "straight"), and one a right. Each machine could be set to different degrees of both yaw and elevation, so the presentation is quite random. However, the rules stipulate that all targets must make a minimum distance of 76 metres. That means that the high, lofty targets will be going slower than the ones that come out low in order to make them land within the acceptable distance.
As for equipment, if you're just playing with it, don't bother buying bunker-spec loads. 24 gram loads aren't easy to find nor are they terribly cheap (no such thing as promos!), but you can replicate them quite handily by buying 7/8 loads. Chokes are typically set to full over improved mod. In fact, that's such a common choice that true bunker guns are only available with fixed chokes set up that way.
There's a ton of different ways to shoot the game, none of which work for everyone, each of which works for someone. But the crux of the matter will be reversing your thinking from "damn I missed one" to "sweet I hit one." Do that, and you'll enjoy it!