I received the spacing below from Dan Craft as part of an email when I requested spacing for a rod. Hope this helps or you could email Dan Craft to confirm.
Regards Mike
10'0" 4pc 8wt
4.5, 9.75, 15.75, 22.75, 30.75, 39.25, 48.25, 57.5, 67.75, 78, 89
Just noticed yours is a four pc. so I edited to amend