Josh,
How's it hanging homey?
this is jordan botto.
On the dp note, i've never had any problems like this with my atr dp, but I would definately try coating the downpipe or maybe you can put some foil around the pipe where it is close to the evap?! Maybe that would help, but it'd probley look 'rigged.' You could also probably use metal ties and tie a piece of heat wrap there too.
later
jordan