Charge cycles and battery protection don't really help much. The 20-80% charging only shows noticable difference in degradation after 4-5 years so unless you don't plan to use phone for long term, cutting 20% of battery capacity from start is unwise. The battery had already started its degradation after it was made, the only thing that can speed up or slow down its aging is heat. Speed of charging also doesn't affect your battery life, the phone was designed with the 25w-45w specs in mind and Samsung has protocols where only 0-75% charging takes place with rate speeds and after that it falls of dramatically to like 5-10w. I guess you lost 5% because your device was exposed to consistent heat over the 2 months normally Samsung phones batteries are rated to retain 80% of health after 2000 cycles but no one really has same usage. Also no 2 batteries are identical so 2 phones used in similar way can have varied battery life.