Definetiley not a cold vape, let's say warm-ish.
I've been able to prevent leaking pretty much completely by per-punching the hole in my silicone caps, I use a metal ink pen cartridge that's slightly smaller in diameter than the attie spike, the spike is 3.04mm and the pen cartridge is 2.88mm.
After pulling the pen tip off I thourghly clean the ink out...then I mound a small diameter pointed round file in a vise, you'll want to use the top end of the pen cartridge as your hole punch, the end where the pen tip came out can be a little deformed.
Gently twist the pen cartridge on the file, quickly you'll have a nice sharp hole cutter, I place the caps top down on a 2 paper towel layer, just push down and you'll have a nice clean hole...don't twist to cut the hole.
As you probably already know, the attie spike doesn't puncture the cap cleanly, it kinda rips it, my caps have lasted way longer with this method.
I'm considering taking the sharp edge off the spike point with some minor filing, I believe It'll further prevent any cap tearing.
Hope this is helpful, works great for me, I rarely have leaks.