Nope, it’s completely fine the way you set it up. I like a small charge (10-15 grams) of a neutral bittering hop like magnum for the length of my boil, but that’s just personal preference. If you want to go single hop, doing it the way you’re looking at is usually best.
I would add more hops though, like double each quantity. I assume your 6 day dryhop is going in during active primary fermentation? If so, that’s fine. I would not leave the second dry hop in there for 3 days (again just personal preference) 24-36 hours does just fine as long as the hops are loose. I get best results when leaving the pellets completely loose and putting a filter around my siphon when transferring (to a keg or bottling bucket) It’s kind of messy, but the difference in taste makes it worth the hassle.
I don’t know how hazy you can get stuff with pure extract (I haven’t brewed with extract for a long time and in my memory it always came out crystal clear) but if you want to add some crazy haze you can probably steep a bit of oatmeal or raw wheat in there for some extra protein.