Okay, here is an update to my adventures in cartomizers.....
Found the Ikenvapes. Alas, they are only standard size where I thought I'd purchased the megas and they are not flanged which I prefer. After a little unforeseen mess from dealing with something that doesn't stop when you push it through, I've managed to dilute the contents of my other tank a bit, prime a new Ikenvape carto, jam it into a (now ridiculously silly-looking) standard sized tank - it's funny how much smaller and inadequate tanks can look when using something larger for a time, don't you think? - and I've washed out the XL tank. Now IT sits waiting for my precious XL cartomizers to come in....Smok first because that's what's out there, and I've put in to have myself notified when the mega Ikenvapes that I want are back in stock.
*sigh*
Life is so difficult in a first world bedroom in first world country. All this....hassle. My poor, delicate self will be scarred for life, I'm sure.
At least I learned a couple of things, though. That has to count for something.
While flanges definitely prevent easy changing of a cartomizer they help idiot-proof cartotank usage.
Couldn't find Boges to my specs. It's actually somewhat of a challenge to find the 3 ohm 2 hole flanged xl as it is in any brand (yes, I know they exist - they just aren't as widely available as lesser resistance cartos).