Looking for Recipes: Greater Shadow Protection & Greater Holy Protection Potions

As the title says, I'm looking for these two recipes for my alchemist.
Have heard that Greater Shadow Protection Recipe drops from Shadowmages and Dark Adepts in EPL, but I've been grinding for days and have haven't seen a single one drop.
Greater Holy Protection should be in the game as far as I'm aware, though I haven't been able to find it yet.

Does anyone have any information regarding these recipes? Vendors, drop rates, best farming spots, or someone that has seen them drop?
Any help is much appreciated.

Greater Shadow Protection has around 2% chance of dropping, so it's not unusual that you haven't found it yet.
Greater Holy Protection does not exist.

There is an addon called Ackis Recipe List that can help you track and hunt ones you haven't found. Drop rates on Lordaeron are generally pretty close and accurate to online databases.