Qorax, sir, are you having any issues getting your feeder wicks out without them breaking off during a rewick? Your new wicking idea looks like it would help with that 
Have you tried mesh feeder wicks? This may be silly, but I was thinking of building it like a genny with mesh wicks and two vertical coils, one over each hole. I also thought having my coils closer to the airholes might be a good idea, but admit the Urba has excellent flavor even with one centered, horizontal coil.
I haven't made any changes yet while I wait for my new 510 base, but am keen to experiment. I will probably put on my PMMA tank as well at that time, but if I do, I'll need to change juice as I have a known tank cracker in mine.
Have you tried mesh feeder wicks? This may be silly, but I was thinking of building it like a genny with mesh wicks and two vertical coils, one over each hole. I also thought having my coils closer to the airholes might be a good idea, but admit the Urba has excellent flavor even with one centered, horizontal coil.
I haven't made any changes yet while I wait for my new 510 base, but am keen to experiment. I will probably put on my PMMA tank as well at that time, but if I do, I'll need to change juice as I have a known tank cracker in mine.