Update:
First, thanks to everyone who responded. I had thought that the permanent seal at the bottom of the glass on my Triton 2 was deteriorating somehow, and bleeding into my juice, causing the bottom third of each tankfill to turn amber, even with a brand new coil. It turns out that this is what happens when you neglect to wash your tank periodically (I used to be more diligent with that). Once clean, I think what I was seeing was probably some kind of fine sediment.
The Kanger Protank 4 (using the .5ohm ssocc ceramic coil) is not producing the caliber of flavor I'm used to with the Triton. I will use it as backup for when I'm washing the Triton and priming a new coil.