I agree with Benjo. The smaller hooks will very easily rip through the trouts lips if you are using a stiff rod. When ever you go to smaller flies you most often also go to smaller tippets. The secret to landing large fish with small flies and thiner tippet is to have a rod that will give and obsorb the energy from the tippet, while bending enough to not rip the fly out of the trouts mouth.

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Best Regards