How many years experience do you have with 'full cleans' and 'power cleans'.
These lifts are very skill specific mate.
You will not stack on 10kg on to your Clean with a 'fresh back' mate.
If you can only PC 90kg you probably don't practice PC much, hence the lower numbers. You should be able to PC about 80-85% of your full Clean, maybe 87-90kg depending on how fast your under the bar. If your not hugely fast under the bar you will be able to PC a higher % be default.
90kg PC is relatively low for a 125kg clean. Hard to diagnose without a video. But my gueses are:
You have a poor pull but are f0cking fast under the bar, hence the poor PC of only 90kg
Poor PC technique
Immense Clean technique
My PS use to be about 85 to a full Snatch of 115, why? I didn't PS often...now I'm up to 105 relative to 120.
There are no hard and fast rules from the floor to the hang lifts. I have hang Cleaned 150kg when I hadn't even done it from the floor but I have now done 155 from the floor but haven't maxed from the hang. It should be pretty similar if your quick under the bar.
The Snatch to Clean is about 80% -/+ 5% either side
You have 'Cleaned' 125kg right? Or you have Clean pulled 125kg to your belly button? That makes a HUGE difference...