Thank you for the comment, I have tried it and here it is.
There is no such problem with JSChart. Even more, no such problems, say, with SimpleResultsTable or Table placed instead of FlashChart - it's displayed correctly.
So, answering the Q1, looks like it's not a Sideview Utils issue.
Maybe this is a weird FlashChart issue, or even a flash player problem in IE, but URL length limitation is really the root cause.
I do use some advanced charting on this dashboard like chart overlays (mixing lines and columns) and some other stuff, so I don't want to be limited by JSChart. But it's a good point to think about it as a simpler alternative when needed.
Q2: As for macros, won't they be unfolded to the same long string as the original PostProcess when transformed to GET query? The problem here is with final URL which goes to the server, not with the search text size in advanced xml.
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