Nice work and well chronicled. Any way that helps get the lime in the water is a big help. I have shoveled and moved a lot of lime and it is hard work. Liming barges use the same pump/spray concept. I would suggest you get the water/dirt checked - it is easy and inexpensive. If yours is a sinkhole then it should be high in alkalinity as they are in limestone formations. The most productive waters around are the phosphate pits as they have natural phosphate (fertilizer) over limestone covered by water. Very high carrying capacity ( some in the 3000 lbs per acre range).