I agree, it's an impressive vape all right. And you're not imagining anything with the uneven heating, it's been pretty widely discussed. IMO it has to do with the cut in the oven floor (actually the roof since it runs upside down.....) being off center. This means the back half of the coil is not getting hot because the air flow is cooling to fast. You can see this if you take off the top half (two screws next to the bowl under the cover) like you were changing coils like in the instructions. While watching the coil in the bathroom mirror blow in the hole where the charge cable goes, tripping the heating. Notice the glowing part? Some guys report improvement by carefully bending the heater closer to the sensor window and readjusting the heating. When my replacement coils get here I'll be checking that out. There's a couple of good photos on the topic in this thread.
Because of the uneven heating stirring between hits is mandatory if you want to avoid combustion.
Battery life is limited, and can be short. I did a careful run with mine on step 2 (325?), using all 8 seconds with a firm draw. 12 such hits took me to an indicated 60% (9.3 bars). I'm rigged up to measure total recharge current, that discharge took me to just under 2/3 total power (I had to replace about 1/3 of a full charge). A deeper discharge, to 10% indicated (1.6 bars), and took 87% of the normal fulll charge to top up. To me the meter seems accurate. More over, the twelve 'full power' hits at the lower temperature leads me to think 36 such hits could be a full charge. How many hits did you take? If you took say 20 on the full one and 10 on the second (at higher temps than me) and they were 8 seconds or so I'd say you're right on par?
I suggest you put some miles on it and see how you're doing then? Enjoy the little guy, see what it'll do?
Regards,
OF