The 5 ohm @7.4 pours thick vapor out. It gets so hot that you actually have to let go and continue to hit it, it's so hot it still Vapes. So you have to be gentle on the button. Now double barrel 5 ohmers...Get your pillow ready.
But I still say don't change carts until you MASTERED the 2.4s. Not just comfortable, I mean master them. It's kinda like karate kid. Once you grab that fly, you will know you are ready. Until then keep training grasshopper.
Is there even a term for what you're describing? I call it "lighting off" when a 5.0 gets hot enough to keep vaping for a sec but still not hot enough to kill the seals or burn the oil.
And yeah... I love "lighting off" the 5.0s, clouds sooo thick.. Very hard to master without torching the seals (giving the unpleasant rubber/metal taste), but they can pretty tasty. (Not going to argue with the 2.4 folks... same materials are in each cart, but some get much hotter - the difference - quit frying your non-2.4 carts!) As soon as that thing lights off, you have to back off or you'll be sorry after the meds wear off. Get it going, and just tap the button every so often to keep it there. It's actually quite hard to find the let off point without watching what's happening. I used a clear tube from the balloon kit of my EQ so I could watch the vapor go into a bubbler (the nibbler-x setup would be great for this) and after a while got "the feel" for it.
You can't quite do it with the 2.4 carts, and that's why they're so user-friendly. You could likely hold the button until the battery dies and the worst thing you might do is maybe scorch your oil a bit. You can get the 1.5s to light off, but it takes a bit more fiddling and will-power.
Now, getting two 5.0s to light off in a dual head without frying one or both? Insanity... and very hard to do, even for those with "lots of practice".