Yatch

I am an experience fisherman that mainly fishes one local lake here in Wi. (now) My lake is max. at 100 ft. Over the years in peak summer (now) I have noticed fish marks in 25 to 35' of water on two flat areas of the lake. Lake is clear with a lot of sand and rocks. Based on my catches lotsa perch, pike and smallmouth. I have boated 3 s/m this year fishing shallow that were 18" . I have spent some time with a crawler drop shot without any bites in these deep areas. I plan to stay with this program unless I find something else to try. Any ideas? Thanks