Maybe you need a new master cylinder for the front and back.
Change the old brake fluids and replace with new.
The brake pads could be worn down.
The rotors could be bent / warped or wore out.
Could be in your head.
But I have noticed that when I used to bleed my brakes on my other bike, they didn't seem as strong for some odd reason. For the back brake, It seems to me that most of all bikes you have to mash hard to get them to lock up when going at speed.
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