Nice job on the chiller.
If you get a few bucks, make another chiller, but only make it 25' long and use it as a pre-chiller. Run your hose to the short chiller and put it in a cooler of ice water, then run a hose to your big chiller in your wort. Stir you wort with your chiller as it cools.
I have 80* tap water and chill my wort to 60* in less than 15 minutes and use less than 20 gallons of water.