I fish the grand river all the time. The carp you see swimming around are spawning, they rarely feed during this, and yes, I have found that they will drive the bass away. Haven't fished many pads there, but if you see fish blowing up on the pads, throw a frog in there and see what happens. I would try using inline spinners, they work great on the rock bass and smallies. One of the most important things that you can do on this river, is find the clear water. I have always caught more fish in the clear water. So pretty much clear water+Spinner= fish. Also, after a rain, try a small popper. They work great. I can also PM you some spots on the Grand that have been the most productive for me.