I've also tried to get this type of thing working previously and given up in disgust! I would try just setting the X Axis values directly after the Paste: 
$sum_sheet->ActiveChart->SeriesCollection(1)->{XValues} "='Summary!'$B
+$1:$G$1";

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In reply to Re: Setting axis data range on Excel chart using Win32::OLE by Ponky
in thread Setting axis data range on Excel chart using Win32::OLE by apple123

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