Have you just tried to use it unpaired and set the percentage to add rather that what percentage to achieve.
On the ohme users Facebook group page most suggest not to pair your car as its more reliable, my cars app can tell me the SOC then one add 5% or 10% to account for losses, to what you need.
On my car I have the max SOC set at 90% so when it hits that it stops charging.
EX30 SMER Ultra