My suggestion does work as I've described. Your case of missing items is not touched on my previous post and this won't work in any section, because report section can only grow to fit their children - they cannot shrink. The height of the group header section would be equal for all pages of the report and even if you manually alter its height (which is wrong), it would be reflected on all pages i.e. it would cut off your visible items on other pages, which makes pointless my suggestion as you get the same problem as with default page header and footer.
the Telerik team