For those with the CFC and high ground water issues (I also use a heart's) - you can try doing what I do. I pump hot wort into CFC with ground water for cooling. The wort passes into a 15' IC sitting in an ice bath and out through a thrumometer into the fermenter.
With that setup and the usual 80+ ground water I can drag an 11 gallon batch to 60-65F in 15 minutes. I just have to remember to shake the IC every minute or so to break up thermal jacketing.
During the spring I'll run about 9lbs of ice, the height of summer about 20.