Your best bet to use topwater frog weedless one. Dont be afraid to fish right on timbers. Make sure that you cast it far away from timber. then reel frog toward timber.. most of time, when frog get away from timber, you should see big blow up.
Or you can do my favorite lure: weightless fluke. just twitching and pause for 1 or 2 second then twitch it again. This method can do with senko if you want to use it. However, make sure you buried hook inside of plastic, not left point of hook out of lure. That's way, lure wont get stuck on timer but will able to buried hook into bass. The bite force will take care of it.
Last of all, weedless jigs. Jigs can be tricky to learn how to use on timber. I got it stuck most of time until I realize that I can felt difference between timber and bass's bite. My losses on jig is reduced big time.