How many kWh is that 5%? Normal rapid pricing is between 50 and 90p per kWh if you’re at the top end of that and got 7/8 kWh it’s not horrendous.
Public charging will always be much more expensive over a timed charge at home.
I'm Autistic, if I say something you find offensive, please let me know, I can guarantee it was unintentional.
I'll try to give my honest opinion but am always open to learning.
Mark