I have a 7880 that never clogs. I can leave it off for 4 weeks, sometimes even more. When I turn it on it will start a long whirring before is ready to print but that's understandable after so many days.
The catch is that I live on very humid geography all year long, so I think it might be it. I also keep my printer in a no air conditioning area because AC dries the air. I imagine heating is N times worse.
I wondering if you could build some contraption to keep the heads moist all the time.
Best
Eduardo
PS At first, I missed the humid towel part which reminds me that it is also about luck. I friend of mine had the worst case of clogging I've heard with the first 17" Epson model (4000?). But then again, I think he used the AC on in his printing room.