Are you getting 3-4 ohms at the coil or across the whole mod? I know if I measure just the coil I get one ohm reading and if I measure the mod with the power supply attached I get a much higher value.
In my experience, when I don't have enough resistance at the coil, even without being able to read any shorts, the whole coil will glow red within a second or 1.5 seconds and then simply flash burn all the juice in the wick in less than 3 seconds (20mm mesh rolled to 2mm with a good 3/4 - 1" extra above the coil). I get a burnt taste at that point. I would say to go to 4 or 5 wraps. That should help tame the power output you are putting in a bit and get you a much more enjoyable vape. At 3 coils I get just about 2 ohms with 32 ga and at 2.9A and 3.7V I can get things to even out and not burn real quick. I still have to pulse the button at about 2 secs on 1-2 seconds off, but it generates clouds of vapor you can't see through, lol.
The down-side to it is that when you do get it dialed in right, you will go through a bunch of juice, but that's not a bad thing since it tastes amazing and you only need one or two good puffs and the nic craving is gone.
I've had a few people try my mod without knowing how much vapor came out and they start to choke on inhale. I love seeing that, HAHAHAHAHAHA
I always get the same response....tastes great but man it's got some kick.
They usually proceed to take another puff or two and almost without fai say they haven't felt that nic rush since they first started smoking.