With powercleans it's best to keep the reps lower, but the form strict and the weights lower too.
Form / technique is 90% of the lift in powercleans, hence why you get tiiiiny women lifting double to triple their bodyweight - it's down to power, timing and technique.
However, those are powerlifting "cleans" - power cleans rely less on a deep bend in the knee to catch the bar and front squat it up and rely on explosive take off from the floor, and strong flexing of the traps and shoulder to rotate the bar as it becomes stationary, and a slight bend at the same time to grab the bar to push it up the last foot.
I tend to do a maximum of 6 reps no matter what the weight is and concentrate on absolute form. If I'm going for PBs my clean technique aims towards a powerclean rather than a clean - i.e. use raw strength.
However I tend to hit around 5 sets min as I get a good burn from that amount.
Typically I start off with:
60x6
70x6
80x6
90x4~6
100x2~4
Then either attempt more 100s, or go up to 105-110 etc....
I may do a dropset back to 60 with exact form.
Form is more important than weight on this exercise - if you do it properly even 40kg will feel like you've been massaged by an elephant.
you really should especially since you play rugby!