Hmm, I never heard of the model 843, and when I look it up
here on their site I don't see it.
Anywho, looking at what you've outlined in red it seems more like the first type of hazing I mentioned (little fine scratches).
All polishes need to "break down" in order to work. Most if not all will do this via the heat produced by the machine.
If one put's too much on the pad and/or does not work the polish all the way through then it hasn't "broken down" so it's not had a chance to do any work and sometimes that will leave the surface dull looking.
If your polishing with a dry pad that will almost surely leave buffer swirls (the fine scratches I'm talking about).
One thing is not to sweat it too much and hang in there. Your not going through anything no one else who has first tried machine polishing hasn't gone through. Like I said before, it's not magic and there is a degree of learning to it.
Everyone here (almost) polishes under articfical light then cleans the panel and put's the car into the sun to see if we've gotten good results.
Try this.
1) Place a clean dry pad on the machine
2) with a spray bottle full of water give the pad a "light" misting.
3) Put some Polish on the pad (about no more than a nickel to a quarter in size total)
4) with the machine off place the pad on the car and spread the polish around your intended work area (keep it to about 2' x 2')
5) Set the polisher to 1000 rpm's and start polishing.
5a) First Pass: go left to right
5b) Second Pass: go up and down
5c) Third Pass: go on the diagonals
When the polish breaks down it will go "clear" at some point after that it will dry out (you can tell this is happening by all the dust you'll be getting)
The trick is to stop after the Polish has broken down but before it starts to dust. So keep following those patterns I outline until you hit that point.
If you stop polishing before the polish has broken down you will not have compelted any work and if you stop polishing after the polish has gone dry you working against yourself cause polishing with a dry pad will put more marring into the surface your trying to take it out of.
You don't want to Polish Dry. That is what will leave the marring and hazing your getting.
You don't need to crank up the RPM's as your not doing something that needs aggressive work (keep it 1200 and below) if 1000 doesn't get you anywhere bump it up a little. I've worked panels at 1800 RPMS but those panels needed that kind of attention.
Don't keep polishing the same spot all day. If your not getting anywhere in one place move to another and come back to that spot later, you don't want to build up heat.
Clean Your pad often during polishing (they have nylon bristle brushes for this) and don't try to polish the entire car with one pad. Even with frequent cleaning the pad will eventually get caked with polish and working with a dirty pad is a no-no.