Manafication doesn't enhance Moulinet inherently. The Moulinet changes (making the 3 hits go from 60/60 to 50/50) RDM got this expac are completely independent of the changes to manafication. What manafication does now is give you 3 stacks of Magicked Swordplay, which allows you to use 3 Enchanted melee actions without paying their Mana costs. Those 3 stacks can be used on 3 moulinets or the 3 hits of your single target combo.

The reason why you're not getting the prefulgence proc is probably because you do your combo too slowly. You get the prefulgence buff if you use all 6 Manafication stacks before their timer of 15s runs out, But if you let those stacks time out, you don't get the prefulgence buff.