I run my drippers high maybe between 80 to 110 watts max.
I have 2 different hammond boxes with dual 18650's and 120 watt Naos Raptor chips.
The raptor is a little different than a regular regulated mod.
It doesn't have the screen and it doesn't check for ohms so you have to build to it's specs.
It has a max of 20 amps and fires to 6 volts so you need to do the math:
http://www.onlineconversion.com/ohms_law.htm
6 Volts
20 Amps
120 Watts
0.3 ohms
So when I build I usually shoot for 0.35 ohms.
You can get an idea of how many wraps you need at what gauge and size here:
http://coiltoy.ermeso.com/
I have gotten really good at it through trial and error so I don't need any of that stuff but I wish I knew about it when I started out that way I could have avoided most of the "error" part of the trial & error
So at 6 volts & 0.35 ohms i'm drawing 17 amps and 102 watts.
That is the sweet spot for me with the Naos Raptor chip box mods.
I have one really nice one that has a voltage readout with a switch so I can see how much life my 2 batteries has.
Fresh ones say 8.4 volts ((2 X 4.2 volt 18650's) and I recharge by 7 volts (3.5 volts X 2)
When I flip the switch it tells me how many volts it puts out when it's firing.
It usually reads between 6 volts & 5.8 Volts all the way up.