Okay, so I'm reporting back. It's been a little over a month and the tank is still pumping gas. I feel pretty confident that everything's solid so, knock on wood, here's what I did.
I followed the advice of Scott and BrewGuru. I played with the adjustment and the regulator gauges but sometimes I would see a slow drop on the high side and sometimes not. So, faced with this uncertainty, I took the first real solid advice available and ditched the plastic clamps. I cut the ends of the hoses and reinstalled with 4 metal Oetikers that had to be pinched on (not the screw ons).
While I was doing this I decided to pull the regulator completely out and took it apart (well, the parts that screw out: the gauges, gas shutoffs, pressure relief, co2 connector, etc) and re-thread taped and really bore down on the tightening; also added a new nylon washer to the co2 connector.
Since doing this I've left the co2 tank open to the kegs all hours of the day and night (before, after the 15 day expiration of one tank, I turned the tank off after every use) and I'm still getting gas and the high side pressure is steady and strong. I'll report back again in the event of any adverse happenings, but again, I feel pretty confident that things are stable now.
(I never thought of pressure changes due to temperature, but the co2 tank is inside the fridge so the temp should be constant.)
Thanks for the help and advice!
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