I struggled with my longer long runs when I trained for my first marathon and so do lots of runners. When your long run is 50% of your weekly mileage that makes it tough, but that's what a lot of beginner plans call for, including the Hal Higdon plan that I used.
If you plan to shoot for 11:30 or so, you should be running your long runs at around 12:30 - 13:00. Remember that you are running extra mileage every week that you won't run the week of the marathon. I think 11:30 is a bit aggressive based on your half time, but I'm sure you're in better shape than when you ran that race.
I would also focus a little more on stretching throughout the week to help some with the muscle soreness.
You are on the verge of an incredible accomplishment. You will look at everything differently after you finish your first marathon. Remember that this is something that only 0.5% of the world's population has both the ability and commitment to do, so no matter what your time ends up being, you are very fast over 26.2 compared to the rest of the world. Good Luck. Let us know how you do on race day.
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