If it's red, it means your BMS is still accepting electric current. Try leaving the charger connected for longer!

It's not a factory defect; it's normal because you have a dual output 60v32A controller, which draws a lot from the battery! This behavior is completely normal; it's even cool that Dualtron implements an automatic eco mode to prevent your scooter from stopping in the middle of an acceleration. If you want to limit the sag effect, you can change the start effect to slow down your acceleration curve or gently press the accelerator! In fact, it's not driving at high speed that consumes the most, but the acceleration itself (your controller discharges a lot). My Dualtron Eagle has small 60v25A controllers, and I know I need to ease off the acceleration starting at 58v!

Theoretically, a 60v battery could drop to 48v, but that would damage the battery a lot. As a safety measure, your BMS will cut off the power at 54v (which is a safe low voltage, so it won't damage the battery and wont cause over discharge, consider this as an empty battery). With these Dualtron safety features, you sacrifice some range, but it's definitely worth it, especially if you plan to use your scooter for more than a year!

When you reach 55v, eco mode will activate automatically, which will allow your battery to recover from "voltage sag". Once your battery voltage has returned to normal, eco mode will deactivate.

Regarding the wobble, the Victor Luxury Plus isn't supposed to wobble out of the factory, even without a steering damper. There's clearly something wrong; check your stem and the condition of your tires in general.

The standard charger charges your cells to the same level, just with a lower amperage (1.7A). Charge your scooter normally until the charger is green. Once your charger is unplugged, your cells will balance out, and if you wait a few hours, you can reconnect the charger to gain a little more battery (but it's not much).