Is it just paranoia or should I be concerned?
Just let the BMS do its thing, loads of people get hung up on range at 100% and trying to work out if they have bad degredation.
Don't forget Tesla DON'T warranty against degredation at all, only pack failure. By charging to 100% all the time trying to make the numbers look better your probably damaging the pack.
I've never seen the car report more than 69kWh of usable energy from 100-0% extrapolated from energy reports from the trip meter for our 75D X. Infact day to day fhe extrapolated figure can be as low as 55kWh.
On loaner 85s, 72kWh is the best I've managed, and even on 100s 88kWh, which is far short of what the reported 'usable' kWh figures give.
To give you an idea how nuts the BMS is in the summer on a long run the extrapolated usable kWh in our car was around 65-66kWh.
A few Ks later and its now reporting around 60-61kWh usable for the same trip.
It that 'real' degredation? Unlikely, is it Tesla fiddling with software? Maybe. But in all honesty what are am I going to do about it? Nothing, so why stress?