Soldato
I found I only made gains on OHP during a proper bulk, when I was cutting I got so far and just couldn't improve. A few weeks into my bulk and I started to progress again. My last session I did 66kg for 5, 3 sets which I don't think is too bad as I weigh 66-67kg. I just takes time for those tiny muscles to develop.
Best way to improve OHP imo is to do strict presses on 5x5 then move to 3x3 with a jerk. A friend who competes in strongman does seated press with bar in squat rack probably last 25% of the lift to the top. He does 130kg+ @ 105 bw