I went to get an rda and looked at the a7 because of that airflow from underneath but the reviews for the a6 were better so went with that. I had a feeling I made a mistake. I also got the tobh clone. I thought maybe I could make a big ohm coil (4/5 ohm say?), take long draws and this would heat slow but bring good flavour at higher watts?
I had a look online at the A6 and I think it's similar to the one I linked to in my first post. I have not used the A7 but I have used the one I linked to, though it's been a while. If I remember correctly, around 1 - 1.2 ohms, 30 gauge Kanthal, micro coil with cotton on a mech mod so running between 11 and 15 watts. Placed the coil high for air flow. I think at 15 watts it was bit much and I pulsed the switch until the battery ran down a tenth of a volt or two. I drilled out the air hole a bit but only a bit. Didn't use it much, but it was a very tasty mouth to lung vape with surprising vapor production
I wouldn't worry too much about coil heat up time unless you're using 28 gauge for 2 ohm coils. The higher your resistance, the thinner your wire should be and the opposite too. I'm running 0.8 ohm coils in a Cyclone (dual coils, but that's irrelevant to heat up time in a mech mod) with 27 gauge wire and it heats up a bit slow, say 1/2 to 3/4 of a second, but I just hit the switch half a second before I start to inhale and it doesn't bother me at all.
I've never tried 4 - 5 ohm coils, but I suspect you're not going to gain anything from that route. I wouldn't make coils higher than 3 ohms and then only if I really understood why I was trying that. Suggest you stay in the 1.5 - 2.4 ohm range with regular regulated mods and a bit lower with mech mods if you want more power.
It never ends, this vaping.
I does for some of us once we figure out what works. I use 2 mods and 3 toppers for 99% of my vaping these days. I have backup gear, but I haven't needed that in a long time
