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I'd probably go 3,9,2,6,10 starting at the top of the piston. That puts #1 and #2 close to the manual's recommendation and 180 apart and allows a good offset between #2 and the top scraper. They all go where they want to go anyway once the engine is running and the reason for initial offset is to prevent scuffing on initial start, at least that's my understanding on V or vertical engines. Having a one piece oil ring gap at the top or in this case, the scraper gaps, makes sense on a flat boxer though and hope they don't rotate to the bottom. Make sure the expander ends are not overlapped and follow the mfr's. instructions on what side of the expander goes towards the top of the piston. Who made the rings? Have you checked the end gaps?
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