Thank you that looked to help with it.

Not a clean fix but for a temporary work-around to keep the sticky menu I modified the custom.min.js and added

if($("body").height()+100 <= $(window).height())
{
	$('#page').after('<div style="min-height:300px"></div>');
}

inside of the else if ( 0 === $(window).scrollTop()){ section so give the page more buffer in the event that removing the header re-triggers the show topbar event.