I'm always reading about total volume being one of (or even the) most important factor when it comes to building muscle. In order to progressivly overload, I try to add weight everytime I can in the given increments (for my gym that would be 2,5kg). If I'm not able to add weight, I try to atleast do one more rep than last workout.
Doing that, I was able to bench press 27,5kg for 12 reps last week (= 330kg total volume). This week, I tried to get myself up to 30kg but only was able to perform 10 reps, which is my minimum goal for one set (totalling in 300kg volume). The fact, that I was able to lift 30kg, to me indicates I got stronger.
But since the total volume obviously dropped, I'm a little confused what to orient on.