Looking for advise on fishing very shallow cold water

[Fish-N-Fool]

I want to try to catch my first ever bass in Feb so I have been hitting a small local lake. For this area it is very unique as it has a max depth of about 6 feet with about 90 % of it is less then 3 feet deep. On a sunny day you can see the bottom everywhere in the whole lake. It only has 2 main deep holes and deep is a relative term. So I have fished it a couple times so far in very cold water temp as I was breaking ice with my boat. I can't seam to figure out where the fish are. I would have thought they would be in the deeper holes, but so far I have not seen any there. The lake is long and narrow at about a mile long and maybe 150 yards wide. It has a lot of just flat bottom about 2 1/2 feet deep with little to no vegetation on it. It has a lot of shoreline with pencil reeds in about 3 to 4 feet of water, this area is where I catch 75% of the fish in the summer. It also has a somewhat deep weed bed that ranges from 3 to 5 feet deep, I catch most of the rest of my fish in this area, it has a small patch of lily pads on one end that I get a few fish from, and last the deepest water is just a mud bottom where I get a few fish as well. This lake has some surprisingly big fish in it for being so shallow. It used to have a ton of monster fish and was the best bass lake in the state back some 15 years ago but due to the shallow water it has winter-kills and about 8 years ago it had a bad one and killed off just about every fish in the lake. It has made a good recovery and I'm getting many 3 and 4 pounders again when i fished it last year. So where would the bass be this time of year. We have had a very warm spring and have semi open water for the first time that I've ever seen here. It has turned cold again and put about a 1/4" of ice on parts of the lake again. I was out breaking ice today trying to find fish but had no bites and saw no fish. I did the Jerk baits and my Sink-N-Fools as well as drop shot. So, where you you look for bass in this environment?