This is what I eventually ended up with.
A fluval 250 that just holds the foam it comes with and the trays have nothing but Bio media. An ac30 that just has two foam pads. Then the ac70 which hold foam, carbon, fine mesh, and Bio. Only reason I use the Bio in the 70 is cause it holds everything down nice and tight.
What you have will work great. Any time you have over filtration it will stay nice and clean. And don't get me wrong you don't need the fine mesh as yours will eventually dissole those small particules. It just that the added mesh does it much quicker.