I am sure this is a bit late but I have had a lot of good catches on Lake Eustis, it is one of the Harris Chain of Lakes. My Parents own a vacation home on the lake so I am usually down there a few times a year.
Dead River connects Lake Harris to Lake Eustis and has held some really nice fish. In fact the fish in my picture is one I caught this year on Eustis. We usually fish from 441 heading north along the Dead River. Just outside of the river into Lake Eustis you will find a canal mouth about 400 yards up. All along that mouth both north and south we have killed them there as well.
We have caught fish on everything from soft plastic (worms, toads) to spinnerbaits, crank baits and such.
Hopefully this helps although I know you were talking about Lake Harris but Eustis in right next door.