Yeah, I also have a Snap-On DMM (Manufactured by Fluke) and I use it for my automotive work.
My 1 week old 0.7Ω twisted wire coil is now sitting at a 0.6Ω. I got the idea of halving the resistance readout when I was speaking with one of the guys over at Holocron Labs (They make a fuse for mech mods) and told me to half the reading for twisted wire, like you would on a dual coil setup.
The setup is a 3/3 wrap and throws out vapor like no tomorrow along with killing juice like a Hummer lol.
I'm happy with the setup personally. I've tried a 1Ω coil and couldn't do it, too cold, not enough vapor. However i've seen videos of people running true 1-1.5Ω coils dishing mad plumes of vapor, so I don't know what i'm doing wrong there. I might switch to a 28awg Kanthal A1 and see how that goes, but I just got a 100' spool of 32awg.
Also, using a twisted setup as you are there is something to bear in mind since it is a parallel coil assembly, your 0.8ohm pair of coils actually = 0.4ohms when finished and in use.
The math is as follows:
R total = R1xR2 / R1+R2
or in practical terms for your application it is:
0.8x0.8 = 0.64
divided by
0.8+0.8 = 1.6
equals
0.4
So your 0.4ohm coil assembly will in fact be pulling 10.5A at 4.2V
Hope this helps.
As far as amperage goes. These are the amperage ratings on the follow AW IMR cells:
AW IMR 18350 @ 700mAh = .7Ah = 8*.7 = 5.6amps
AW IMR 18490 @ 1100mAh = 1.1Ah = 8*1.1 = 8.8amps
AW IMR 18650 @ 2000mAh = 2Ah = 8*2 = 16amps
8 meaning 8C, the max continuous discharge rate.
Plugging in all my setup specs:
Fresh Battery: 4.2v
Lowest Point I use it: 3.65v
DMM: 0.6Ω
Actual: 0.43Ω
Max Amp discharge (DMM): 7A
Min Amp discharge (DMM): 6.08A
Max Amp discharge (Actual): 9.76A
Min Amp discharge (Actual): 8.48A
*This is not including the internal voltage drop from the mod and RBA.
Only battery to use safely would be my AW IMR 18650 in terms of actual, but in regards to DMM readout, 18490 is well within the safe zone. However, I use a 18490 on the go. I test my setups and get them running stable via 18650 and then use the 18490 or even 18350. Never had any issues, and the 18350s are about a year old.
Scary... I'm probably next runner up on the Darwin Awards if Holocron Labs was correct...