Simple question : Was it your last Split shot not accounted, or the first one due to WF+splitshot not registering the first hit taken ?

(If fey wind is the answer, it's still a bit sad that WF damage get so much conditionned by composition. 6 GCd means 20% more GCD and even if they aren't the only contributors to WF damage, it's probably around 10% more, WF damage overall )