Ceegary, washvap, and zombite,
I don't want to speak too soon, but my tanks seem to be "settling in" yesterday and today. I'm getting fewer episodes of leaking. Only one or two times among all four filled tanks. I don't know why this is happening, but I'll take it happily.
I did order 14 of the Ideal-brand 20ml veterinary Leur-slip syringes yesterday from an equine supplies site (that specific brand of syringes has rubber seals that are twice as thick and much heavier-duty than most). What the heck, the syringes were only 60¢ each shipped and should be a snap to make into tanks.
Heaven knows why I persist in this tank venture. I didn't really mind the need for frequent topping up of cartos. I was quite happy with Smok Tech mega-XL clear dual-coils, and I like the 1.7 ohm XL Resurrectors even more. But, you know, the quest for the Holy Grail of vaping delivery systems is never-ending. Heck, I now own 35 PVs/mods, among them 12 variable-voltage boxes, 4 eGo and 3 E-power units, 4 Hello 016 batts, 2 Phidias feeders, and a bunch of other tube and box mods (in 3.7, 5, and 6-volt versions), plus about 250 atties and cartos of all types. All I can say in my defense is that at least I don't play golf or collect sports cars, LOL, and all 7 of my Madvapes VV boxes cost less than a single Darwin or ProVari (not that I'm down on pricier mods---lots of folks understandably love those high-tech units, but I've not personally felt the need to own any of them).
Overall, I'm pleased to report that my vaping hobby/obsession provides me with much more satisfaction than aggravation. That's been true since I started vaping a year ago, and---as long as it remains true---I'm mostly a happy camper.
I also consider the many friends I've made on ECF (and especially here on the RY4 thread) as a significant part of the real joy of vaping.