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With that length of run I would suggest that you change as much of your intake as you can over to 3 inch pipe and run our output as 3 inch or at least 2 inch until it gets to your distribution manifold..
If you can't just to give you some numbers in 1.5 inch pipe with 40 feet total pipe (I calculate 18 feet on your numbers and then double that for the pump intake) going from 6 to 7 elbows only decreased the flow by 30 gph.
If you use 2 inch pipe up to your manifold, a normal 90 will have less resctriction than your 1.5 inch pipe with no direction changes at all. So I would still suggest go one size larger in pipe and don't worry about finding great fittings, you can use what ever is easy to find locally.
Kim
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