I’ve removed Healing Surge from the AoE macro as it seemed to be only casting that for a while (during GC I think). The result is that far less mana is used and I can keep healing.
Have you checked out the updated forum post i made on these? https://wowlazymacros.com/forums/topic/restoration-shaman-8-1-0-admiral-smurf/
Check out the link and let me know how those work for you over there. Thanks for your input!