Glad you found a solution, but did want to ask if you were using textareas or fields? And whether or not you started with the default
CheckMultiPage format, which has the remittance on top and bottom and check in the middle. The reason I ask about field/textareas is that textareas expand while fields do not, so you can size a field to be the size of the section and it will never go larger or smaller than that.
CheckMultiPage report uses the
checkdetailformatted database function, and one of the parameters on there is the number of rows to consider a section before clipping to second page. If you did not start from
CheckMultiPage I would suggest checking out the tricks it uses.