I generally use a uni to uni knot to connect my flyline to my leader of roughly 6-8 feet. I use a halibut slider on my bottom rig also tied with a uni to uni and have yet to have a knot fail. Even with multiple larger toothy fellas pulling on my flyline the uni stood up just fine for the 3 in a row I got one day (only 2 landed) I definitely check the leader and always retie my hook after every fish.
Just my own 2 cents that is only worth a penny.
Matt
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