Currently I am trying to gain strength and muscle doing a push pull legs split. Of course I am always trying to progressivly overload my muscles. If i am trying to for example increase my dumbell bench press and my desired rep range is say 8-10 reps. If i reach 8 -10 reps with 20 kg dumbells one day and want to increase it to 22 kg the next time, i won't be able to reach the rep range of course. If i can do 5 reps with 22kg in one set, do I in the same set, lower the weight and then complete the set (8-10 reps) or do i stay at 22 kg and just do as many reps as i can each set, increasing the amount of reps i can do with the same weight every chest day?