May just not be there yet, don't give up. Look for boats and try those areas, I know it sounds kinda tacky but hey seems that's crappie fishing on big water and when struggling I use just like everyone else does. Creek system or river system with 15 foot of water over the banks here is good a lot of the times, zig zag back and forth across it, sometimes just going straight across the does this as the creek or river is zigging and zagging on its on. GPS in the depth finder is key, good maps in it helps as well, when you hit a fish mark it, mark em all to start with and it will show you a pattern hopefully. Flats are easy fishing when they are there but sometimes you have to go a little bit shallow or into the timeber some. When it starts happening for you it will be like a switch was flipped so like I said earlier don't give up.
If there is a lake close that is loaded with dinks go fish it, may not be catching the fish you want but you will be learning. The year I started this is what we did and it helped a lot just getting the experience of catching some fish and working thru the lines and such. good luck.
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