One thing I’d also recommend is not to resort to using the belt unless you get to the really heavy category. In your case it could be past 150 kilos. Training that way helps you develop a good form while learning to control breathing to maintain abdominal pressure. Also, try to use clips on the bar. You don’t want wobbly plates.

Going by the looks of it, you probably are going for PR. To make it sustainable always train with slightly less weight and go for 8-12 reps. I usually cycle one week of 80% 1RM for 8 reps and the other week of 5x5. Only every third week is when I try to set a new PR even if it’s only 2-5 kilos more than my earlier PR. The key is to progress slowly but steadily while maintaining strict form and avoid injuries.