Parameter initialization timing

On the creation of my main data table, I initialize some Report Parameters based off the contents of that data table (row count & column sum). Further down the report I use these parameters in my "hidden table" that finalizes and organizes values for my chart.

I have successfully built a chart AFTER (below) the "hidden calculations table" but I need the chart at the top of the report. When I try to place the chart at the top of the report, the variables haven't been initialized yet and the chart breaks.

+-----+
|chart|
+-----+

+---------------+
|Main data table| [A visible and formatted table; Variables initialized here]
+---------------+

+-------------------------+
|hidden calculations table| [Variables used, final organization for chart]
+-------------------------+

I've played around with plugging different scripts into the table's "On create" and the charts "On Render" but haven't had any luck.

--Is there a way to postpone the chart creation until after the final table is built?

--If not, are there scripts I can plug into the chart's "On Render" phase that can grab the values from the table before the chart is built?

Thank you in advance for any help provided!

Patrick