Need hook setting advice

Hi All,

I got to spend a whole hour and ten minutes on
the river last Thursday. Had something unusual
happen to me that I would love the groups advice on.

These trout must have been caught several times before.
About every third drift, I would tangle with one. It
seemed like I would play with them for about two feet
and then they got loose. Over and over again too!
I checked my hook points constantly and they were
not broken off and were plenty sharp.

One trout I got so frustrated with, to set the hook,
I dragged him about four feet across the top
of a rapid. And he still got away! I could almost
hear him yelling "Yippee! Again! Again!" (I may be
putting human emotions on him.)

I had the feeling I was playing tug-o-war with them
and had not actually hooked any of them.

They seemed to like all types of flies I tossed at them.
They would get use to one and I would put on a different
type. They were all in the size 12 to 14 range.

What would the group suggest? Smaller flies? Larger
flies? Flies with round hooks? Shake my fish at
them and try not to grin too much?

Many thanks,
-T

p.s. I got to meet one 7" rainbow. He nearly swallowed
my #14 Adams. I think he was native as he was about two
inches smaller than what they plant and he was not so
danged ugly.