Buddy, let me attempt to give you some useful advice.
The Inferno (yes, I have one - the Red Inferno kit) is a custom Joye eGo made for Volcano. I have no official confirmation of that - Volvano plays the card really close to the vest, but all you really have to do is LOOK at the thing! It hekps if you have a Joye eGo as well. I have a feew of those as well. The Inferno is a great PV, I use mine all the time. I still think Volcano messed up with the slip-on cone instead of threaded, but that's another conversation....!
I have the Volcano Magma as well. It is a 510 ecig, and uses the same atomizer as the Inferno, and the eGo. I think the Magma attys are good ones. I'm guessing they're made by Joye also. Nonetheless, if you are screwing a Magma atty onto a charged up Inferno batt, then inserting a juice filled cartridge into the Magma atty, the putting the tip of the cart in your mouth and pressing the button on the Inferno and drawing air into your mouth.....and you have problems getting vapor, there is something wrong.
You said "To be able to get an even decent drag with the magma atomizer (a new one mind you, not one needing cleaning), I have to take a 5-7 second drag each time sucking fairly hard."
There should be no reason for you to be "sucking fairly hard". Perhaps that is the problem., You have to remember that the liquid must atomize. It must be heated by the atty to the point that it turns to vapor, which you then inhale. It is not lkike smoking a cigarette, where the harder you suck the more smoke you get. You may be trying to draw faster then the atty can turn the liquid into vapor. A 5 to 7 second drag, done moderately - NOT HARD should get you a mouthful of vapor. Actually, the harder you suck the LESS vapor you will get because you do not allow the atomozer coil sufficient time to heat the liquid the the point of vasporization. You will get a lot of air and a little vapor. Try adjusting your vaping technique and see if it makes a difference.
I have never had any problems with my Magma or Inferno. They always produce plenty of vapor, even with 2 month old well used attys that have never been "cleaned".
You can use a low resistance atomizer (I use them as well), and it will create vapor faster because it burns hotter. Although that may give you temporary satisfaction because it will produce vapor faster, it doesn't address the more lingering problem of why you are having difficulty with the standard equipment.
And a couple of other observations, if you get 5 drags off of 3 drops of liquid on a Cisco atty, there is something wrong there also. With 3 drops on my Cisco (my standard drip), I get 15 to 20 good drags before I start to get the metallic burnt taste because I've vaped it almost dry. I add 3 more drops, and I'm on my long way home again. Perhaps it has something to do, again, with your vaping technique.
Also, if you use a low resistance 510 atty you don't need to go with dripping. It's made to have a cart stuck on it. I have no issues with my LR attys and carts, which is really the only way I use them. AND filled with BlueFoam. I have no problems with the BF either. It wicks like crazy, I get most of the juice from the cart without ever starving the atty, but sometimes it wicks TOO well and I get more juice than I want, or the atty needs. That's when the "reverse thermometer flick" comes into play. To shove some of the excess juice BACK into the cartridge. And carts, particularly ones with BF for wicking material, have no problems "keeping up" with an LR atty. But that takes for granted that you actually wait a second or two betweens puffs. If you don't, it's just one long 10 minute inhale, and I don't think anyone even TRIES to do that. Yes, you could vape so fast that the LR atty would dry burn because you have basically kept it lit up, but "Extreme Vaping" of that sort is best left for a Juicebox.
Draw long and slow. Remember, it's not a race!
And so, perhaps there may be some useful information in there for you. Or maybe, at least, give you some things to consider.
Steve