I wouldn’t say an increase of roughly 1.8p/kwh on Go Faster was really significant unless you were on an old version of the scheme still 15.96p/kwh is still very reasonable I was paying more than that on their 2 year fixed deal I just came out of & now I get the benefit of the 5 hours at 5.5p too.
Currently I’m using the granny charger and a tp link kp115 smart plug with power monitor g to ensure car charges during cheap time & I can see what’s gone in.
Those new Hypervolt home chargers look really cool, each one has a raspberry pi as a controller/analyser built into it bet you can do some very cool stuff with that