Did you sharpen your hooks?
Most non-premium hooks come out of the box dull.
If you have access to a low power microscope, you'll be shocked at how dull the point of a standard hook is.
A sharp hook will tend to "stick" when drawn lightly across a fingernail.
It's wise to touch them up after snags, fish, or just long use.
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There's a school of thought that a barbless hook will penetrate deeper, than a lightly set barbed hook, and actually hold better.
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Pressure... Is a judgment call. Fish weigh more in the air than underwater. If the fish is big, and the tippet is light, and a jumping fish lands on a tight tippet, you could break off. Some people advocate throwing a little slack during a jump, (my reflexes aren't that quick).