Personally, I've never taken a laker on a flasher/fly, but that hasn't stopped me from trying! I'll always have a green/green crinkle or a white/white out, but I use full size off the riggers, and haven't taken much off the riggers ever, so I've just started to use a dipsie with a smaller greeen spindoctor/fly, but even that hasn't produced yet. Maybe smaller, like RR is using, and higher up, is the way to go...
RR - what lake are you runninng out of? I've been out on Seneca only a few times this year, but they've been spanking me! I think the concensus from a lot of guys is that this year is a lot slower than most, for whatever reason....