For those that have experience fishing the Great Lakes tribs, when do most of you utilize sink tips ? I'm fairly new to the art of Spey. So for my first season (last year) I stuck with my floating tip so I could learn to cast rather than focusing on the fish. Now that I can at least lay out my line most of the time I'd like to start fishing and not merely practicing as it were. Not that I'd ever mind hooking into a fish during practice. Is it purely a temperature dependence thing or does holding water depth play heavily? I'm using Rio's Windcutter veristip sytem so I know I 've got plenty of options when the time comes to sink my fly. Thanks.