Jessica, I asked DH, who works for a paint company. You're probably not going to like this! He said one problem is the Satin paint; with flat, you probably wouldn't have had the problem. If you want to get rid of the roller marks, you're going to need to rent a paint sprayer and spray the wall. A roller, because of the texture, will always leave "stipple" marks, at least. A brush also has its own texture issues. If you don't want to use a sprayer, look at the nap of your roller--the thicker the nap the more marks it will leave, so get a thinner napped roller. A mohair roller, according to DH, will be your best bet if you don't want to spray the wall.
Paint sprayers can usually be rented at paint stores or home centers. Good luck! I'll be out of town for a week, but I'll check when I get home and see if it helped.
If this is the worst thing that happens all year, I think I can deal with it!