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Usually on gasoline engines, changing the gears will result in largest efficiency gains.
On an electric bike, gear changes are directly related to acceleration and torque, since the bike doesn't have any gears.
Efficiency gains are also minimal, since electric motors don't have that much of more friction at higher rpm, but I would be interested to see if gearing can affect range on these bikes.
More than likely, the bike has plenty of acceleration anyway, so changing the gears by 20% should still give you reasonable acceleration.
If you're lucky, you can find a front belt pulley from another bike, thats slightly larger. If not, you could do a chain conversion, and hope that the gains in gearing doesn't affect the chain over belt losses.
Fast charging through more amps, is a good way to destroy the batteries.
The first 50% might be ok, but after, the slower you charge, the longer the batteries will last.
The only other option is to find a storage space (like under seat, rear storage compartment, side storage), go to bms batteries, and install a battery there, that you can connect to the bike's charging port.
But your bike's weight will increase significantly.
For a windshield, it is best to buy a very curved one.
The curved ones will blast more wind to the side, and leave little bufetting at the face.
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