One of the best strategies to employ when silvers stop biting is to give them a changeup. Switching from one presentation to another will often yield results. But most of the time just a subtle change with the current presentation is all that is necessary. On the Sky, (yes, I know it's not open!!!) in years past, I have used subtle changes quite effectively. One of these is employs the use of two types of spinners, a #3 vibrax and a 1/4 ounce roostertail. Switch them often while working a stretch of water, so that holding coho get a good look at both. The vibrax has lots of flash and vibration, whereas the roostertail has a "buggy"-look to it (and runs deeper too).