I've been adjusting levels all day. I'm not too happy with the results though, the pics lack shadow detail
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The trick is to move your black-end histogram slider towards the curve, while watching the image, until you have rendered unimportant shadow details as black (Zone 0 for us film luddites), but left desired detail in other dark areas, which by definition are not jet black (more like Zone II or III). This can be tricky, and is essentially an aesthetic decision.
That said, it may be that you need to increase your film exposure to capture more shadow detail in the first place. It may also be a limitation of your scanner, but I agree that the histogram looks as if you're getting all the black there is to get from that negative.