Personally I like using the trap bobber on hard fish, on the basis that they're going to bounce around a lot, so they're going to spend some time outside your bar basically whatever you do, so you may as well decrease that penalty. Others like cork bobbers.
I wouldn't suggest using a barbed hook - as the description says, it works best on slow, weak fish, so it's probably not helping you that much.
Also, you might want a better buff than trout soup. (If you didn't know, you can increase your skill level past 10 with food buffs, and each level increases the size of your fishing bar.) Seafoam pudding is the best, but it's hard to make and doesn't last very long. Lobster bisque is nice because you can get the ingredients in any season. You might also have some leftover dish o' the sea from the specialty fish bundle reward, if you've done that.
There's a full list of foods that have fishing buffs on
this wiki page.