That was a fairly heavy beer and it just takes the yeast some time to work through it. The heavy krausen is evidence of their hard work. The krasen will recede from it's max height but you'll likely still have evidence of some of it on top when the beer is finished. Once you get consectutive gravity readings for 2-3 days it is done.
You should be able to leave most of the heavy sediment behind when you move it to the bottling bucket so no worries there. Also many people leave their brews in the primary on the trub for 4 weeks or more. I think autolysis has been a bit overstated in the past, and you are fine at 4 weeks on the trub.
Sounds like it is going to be a yummy brew. You should notice an improvement in flavor from using the fresher ingredients as well instead of from a kit. Just give it some time to age in the bottles and enjoy!
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