ive been ice fishin for trout since i was 5, and believe it or not, you wanna forget all about fishin deep. for the bows, you wanna stick to shallow rock flats. in the winter, they cruise these flats. i fish in anywhere between 5-15 fow with a minnow or wiggler about half way down. jigging w/ a sweedish pimple works well too. you also wanna stay real quiet, not a lot of movement on the ice cuz rainbows r real spooky. when i do fish over deep water, ill set a tip up about two feet under the ice. As far as fishin at 4 in the monrin, its not necesary. ive actually had my best luck ice fishin for rainbows between 7-9 in the mornin and 5-7 at night. hope this helps. if ya need any more info, just send me a pm. happy new year