69%, you mean F right? my house is at 65F and I get very good CO2 production with the same recipe you're using. The water temp you used was warm, perfect, it should be working. Also give it at least 24 hours to start, thats how long mine takes.
99% of the time it's leaks. Submerge the whole setup in a bucket of water and check that way...The best way to be leak free is to drill a hole smaller than the tubing, cut the tubing at an angle, and pull it through with some pliers.