Somebody gave you bad information. I've never heard that charging about 20-30A is harmful. If you get a full charge in the morning at that rate I guess it couldn't hurt but if you need a faster charge go ahead.
That is the opposite of what I said.
After spending thousands for dual chargers and getting an extra 100A circuit wired to my garage, I learned that Tesla recommends charging at much less for the purposes of battery longevity.
They recommend dialing down the charge amperage from 80 to the minimum amperage necessary to recharge by morning. Actually told me to look at the vehicle display for estimated number of hours to charge and dial the charge amps down until the number of hours to charge = number of hours until I will drive the car again. It all makes perfect sense and I'm not complaining, I actually appreciate the recommendation from Tesla, and wish the car would automatically figure this out for you.
But for the purpose of this thread, I was advising Robert against spending money to "throw out" a perfectly good 30A EVSE because in the end that would be all I needed to recharge my power hogging P85D. That is, unless Robert drives substantial miles per day or doesn't have enough overnight hours to recharge.
Robert take the average number of miles per day you drive and divide by 17. That roughly approximates the number of hours it will take to charge using your existing EVSE (Although YMMV depending upon driving style). Then ask yourself if you will typically have that many overnight hours to charge.
For example if you typically drive 100 miles per day, it would take just under 6 hours to charge. Are you normally home from 11pm to 5am?