It would work fine with a 1.8 ohm coil. Certainly wont chuck clouds. Ive used the TDUX series and aspire glassomizers on a VW mod and often went over 4 volts.
Oh I agree, you could use a 1.5 ohm Protank 2 head on it if you wanted and it would work...just those little tiny 33 gauge nicrome coils don't hold up well above their recommended voltage...I used to buy those 1.5 ohm heads and run them till they died and rebuild them with Kanthal. Stock I'd be lucky to get a week out of them if even that because I would always run them at 12 watts which blows their little nicrome minds
rebuilt with Kantal a 1.3-1.5 protank 2 head would last me a couple weeks easily...sometimes a month if I dry burned and clean them regularly....
when it comes to those old heads it's not about if they can...it's about how long they can hold up doing it...I figured out how to dual coil protank 2 heads before Kanger came out with those aweful dual coil abortions they call coils for the aerotanks and PT 3's....and even with two coils in that tiny little space they would last me two weeks...the only problem with dual coiling a protank 2 was since I didn't use NR wire on the leads out of lazyness I would melt or warp the bottom pin insulator and have to replace it every so often but luckily Lightening Vapes sells them. The only other odd thing I noticed about rebuilding those old heads is that if I let them sit for along time they would screw themselves up...I rebuild ten of them one day so I would have a stock and by the time I got down to the last three, two of them were not metering right and I had to do them over again....I don't have a reasonable explanation for it since I test fire all of them when I build them and meter them all the same but it still happens...it's just weird...
Sorry, I know that rant was a bit off topic but I thought I'd throw my 2 cents in plus an extra penny for what it's worth