I was having similar battery life on my 2020 Intel MBP, and I found turning off the "Manage battery longevity (As your battery ages, maximum capacity is reduced

I was having similar battery life on my 2020 Intel MBP, and I found turning off the "Manage battery longevity (As your battery ages, maximum capacity is reduced to extend battery lifespan.)" setting improved battery life by an additional few hours.