The 'dish'. The spokes on the drive side of the wheel are slightly shorter than the spokes on the none drive side. This allows the hub to be off centre in the frame (to give gears clusters the room to fit) whilst the rim is centre to the frame. This is the dish of the wheel.
Tighteming each spoke a complete turn is a lot, but (for sure) you have not distorted the hub casing.
So
1 Turn the bike upside down and spin the wheel by hand. Check to see if the rim is catching on the frame. Check to see if it is catching on the brakes. Also check to see what lateral wobble there is (if any). Also check that the rim is running concentrically to the axle.
If any of these are out, let us know and you'll get talked through the remedy.
2 The motor symptom you talk about is almost certainly electrical. I know, it sounds 'orribly mechanical, but it rarely is. As vfr says, do not keep using the throttle as you
will burn something.
To fault this you are going to need a digital volt meter and some photo's. One of the whole bike, of the motor, the controller and any or all the connectors you can find.
This can be a steep learning curve, but follow the advice and you can become a self repairing cyclist/e-biker with help from this site. I know - 'cos I am that man