Handling a routine where one exercise consistently feels much harder than the rest

My workouts include squats, rows, pressing and a few accessory movements. Everything progresses slowly except overhead pressing, where even a tiny weight increase makes the set feel impossible. It's frustrating because I assume every lift should improve at the same pace. Is it normal for smaller muscle groups and different movement patterns to need much smaller jumps? I'm considering adding reps before weight, but don't know when to stop forcing linear progression.