Multiple Source Join

I have a logical table with three sources. The query that's being generated is properly selecting information from all three sources, but it's not putting them together the way I would like.
The query generated looks like this:
WITH SAWITH0 (query1 from source1),
SAWITH1 (query2 from source2),
SAWITH2 (query3 from source3)
SELECT
FROM (sawith0 LEFT OUTER JOIN sawith1
ON sawith0.c2 = sawith1.c2
AND sawith0.c3 = sawith1.c3
AND sawith0.c4 = sawith1.c4)
LEFT OUTER JOIN
sawith2
ON sawith0.c2 = sawith2.c2
AND sawith0.c3 = sawith2.c3
AND sawith0.c4 = sawith2.c4
sawith2 will always have a more comprehensive set of values and I would like to use that as the "outer" source in the join. Is there any way to set this in the BMM?

Thank you for you replies, and I understand what you're suggesting. I'll just need to think a bit to see if I can make that work in this situation.
It's essentially a union query, which I initially tried in Answers. Unfortunately, in Answers, the union query limits your formatting and manipulation capabilities, so I moved it to the RPD. For the most part, it's working as I had expected. I was just hoping that since it consistently uses the same table as the outer join member that there might be a way to set that relationship.
Thank you again for the replies!
Regards,
Greg

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