Very few DNO’s are allowing upgrades to 100A on single phase supplies anymore, as previously mentioned.
Reg 722.311.201, permits load curtailment, including load reduction or disconnection,which can be automatically or manually and may be taken into account when determining maximum demand of the installation.
In English – The use of a current clamp (CT clamp), will serve the purpose of monitoring total load and if necessary reduduce (Curtail) the load to below 80A, if there becomes a risk of the supply overloading.
Your maximum demand of 92A is broad and subsequently overrated but, is required to determine whether a residential property requires more than one phase, as set out in the onsite guide for calculating diversity, maximum demand.
Are the installers still on track with the install.
How you finding the car?