Agnes Black
On the positive side, I have had the same pack of smokes for over 2 weeks and rarely feel the need to light up. TBH tobacco tastes gross nowadays
To not feel the need to touch your analogs is an achievement on its own. Since you love the technical side of things, then I would definitely suggest to research Ohms Law.
Agnes Black
The iClear I have is 2.1 Ohms and the kanger is 2.4, so I've been sticking to 4v and using about 8w. If I use 11w on the iClear, I cough myself from the massive amount of vapor it produces. LOL I'm a gearhead, so I like to delve into the technical side of things. That's why a coworker said the MVP would be a good choice.
In your case, if the last number that you edit was Volts (U) and you set it to 4 volts that means for your iClear (@ 2.1 Ohms) you are pushing 7.6 Watts; for your Kanger (@ 2.4 Ohms) you are pushing out 6.6 Watts. The lower the resistance, given that the volts remain the same, the Higher the Wattage you are pushing. The safety aspect of it all lies in the Amperage you are pushing which maybe another factor to use to determine the end Wattage. For as long you do not exceed the Amp rating of the battery, then you should be generally safer.
BUT if the last number you edit is Watts (P) both your Kanger and iClear is doing 8 Watts, or whatever you set it to. There is no math involved on your part, and the device will remain in safe parameters for the most part.
So now you know 11 Watts is not for you, so try 10.5 Watts, and keep of tapering it down until you find YOUR sweet spot

. As you get deeper into vaping you will find out that Ohm's Law will play a HUGE part of it especially in safety.
At the entry level of p laying around with the Voltage setting you really need to pay attention to one thing. That is your batteries limits, specifically the Amps the the battery is rated to handle. For the MVP 2.0 that is 3 Amps. So if you go with the Voltage setting you can do whatever Volts and Ohms combination that you like, which will have its different Wattage results, just don't go above the Amps.
If my math is correct the highest Wattage that you can achieve while still within the limits of the MVP 2.0 is 15 Watts @ 3 Amps (5 Volts with a 1.66 Ohm coil). The MVP 2 will not allow you to go past 11 Watts, which is why if you use the wattage setting you will unlikely go beyond the amperage limit of the battery.
BUT if you use the voltage setting and you build a 1 Ohm coil in your Protank and Fire it at 5 Volts that would end up 25 Watts @ 5 Amps and hopefully not a trip to the ER
Sorry for rambling on

but yeah I highly recommend sticking to Wattage setting (for now), and go with what I said in my 4th paragraph.