Just an update for you all.
I just got some new e-juice in the post yesterday, so I thought I'd try a fresh Plexus 0.5 Z-coil with a clean tank and the new juice, which is 75/25 (VG/PG).
No good. I primed the coil with many drops and let the filled tank sit for about 25 minutes, then went outside and started the 0.5 plexus at 14 watts - the low end of its wattage rating. First two puffs were good, then I started getting a slightly burnt after-taste on the exhale. So I waited a while, then bumped the wattage up to 16w and tried again, but then was getting a funky chemical / coil taste. Not burnt, but not the kinda flavour I seek from my juice. I had the funky taste and a burnt taste with at least 2 other plexus coils I have tried so far as well.
I'm open to suggestions. I normally like to puff every 10 seconds or so (ok maybe 5 seconds at times), for a puff length of 1-2 seconds, for 10 or 15 minutes. Sometimes if I need to I puff a bit faster. Am wondering if I am pushing the Z-coil too much, and it is having trouble wicking fast enough?
Strangely enough, I then took the plexus Z-coil out and put a fresh 1.6 Ohm coil in. Same tank, same juice, and... no problems.. I was able to vape away without thinking about it, and no funky taste, and no burnt taste.
It seems to me that the plexus coil has trouble wicking fast enough for me perhaps, and that may explain the slightly burnt taste? Or does it need breaking in more? I read the Z-coil was supposed to offer faster wicking?
Or maybe I just got a bad bunch of plexus coils? Either way, at the moment, I am back to the 1.6 coil and no worries at all. Also, if anyone is interested, the 1.6 coil is handling the 75/25 (VG/PG) - higher VG - without any issues so far, but I haven't chained vaped my head off with it yet.