Guru - As shown in the attached demo file, you can limit the Bar/Line to display only 8 values, and un-tick 'Othering' to avoid showing another aggregated 'Other' bar.
Currently, the sort order of Date/Time fields used as an X-axis Split by is chronological, but If you duplicate the Date/Time field, set the duplicate to display only the week number and re-type it as a Text/Category value, you can manually re-arrange the sort order from alphabetical to reverse chronological order.
Data> Manage fields {Field} {Category} Options > Value order
This will ensure that the latest week is displayed in the Bar/Line View on the left, and the values for 7 previous weeks arranged to the right. (careful - don't use the option to sort the bars by the values displayed)