I have always struggled with this. The current puts such pressure on the line, and hence the tip, that I can't see how I will notice a shy roach bite. It will make very little difference to the tip position. I know that I have to let out some line so the line is in a bow, and that helps a bit, but so far I've never felt this solves the problem.
I know that one option is upstream feeder, but I have never made this work in a wide river with weed. Maybe I'm missing a trick?
Has anyone tried bolt rig in this context?