There are published curves which reflect the optimal charging rates and capacities of Tesla's batteries. In general, its best to keep the battery under 80% and above 20% SOC, although recently Elon has stated that there is not much of a difference in the long term between 80 and 90 percent. I would also suspect that there is not a significant difference between 8-10 AMP rate of charge and 30 AMP rate of charge at an L1 charger like there would be at 120-250kWh super charging session which is several orders of magnitude faster than your proposed charging rate.
If you are finding that you're often in excess SOC in reserve and you don't need it for emergencies, it may make sense to drop back your frequency and SOC. I've been keeping my car between 65-80% whereas I used to keep it at 90% after I read Elon's tweet simply because it is not a requirement that I have. The data I have seen on this seems to indicate that this is better for the battery, although it was based on older battery technology.
Interestingly, there is some data which appears to suggest that Super Charging at rapid charging rates is not only NOT bad for your battery, but may be suitable for it because it reduces the amount of time the battery is subjected to heat. Similarly, there is also data which indicates it is good to exercise the battery periodically to full capacity and down again.
The challenge I have with these statistics is that they're subject to change as the battery chemistry and design changes. In 2014, Elon Musk tweeted that its best to keep the battery between 30-80% SOC. Here is some data which suggests keeping the battery charged to 70% is optimal:
https://electrek.co/2018/04/14/tesla-battery-degradation-data/.
Newer battery technology seems to be more forgiving, and one battery expert I know personally who is involved in Tesla Battery mentioned to me that it really doesn't harm the battery to take it up to 90%. Nevertheless, my rule of thumb is, if I don't need to do it, I won't.
