The 75 is a 350V pack, and Tesla limits the current they can receive via supercharging to around 350A. This means the maximum you'll ever see during charging is about 98kW, and even then only for a short period of time during the taper if your battery is warm (but not too warm!).
The old 70 is actually also a 350V pack, but has different battery chemistry (same as 85), which Tesla allows to charge (briefly) at higher currents. So if your battery is warm, you may see supercharging up to a maximum of about 116kW, but again, only under ideal conditions and only for a very short part of the charge session due to the taper.
So.. make sure your battery is warm, make sure you're on a full speed supercharger, make sure you're not paired with another car, make sure your SoC is somewhere between 20 and 50%, and then you should see around 116kW on your 70.