Goto
http://sony.storagesupport.com/
Download updated firmware for both of your drives.
Download firmware for u'r model nos only.
Any other model no. & u'r drive is screwed (if firmware updater does allow it).
Anyway, before writing, insert the blank CD/DVD & keep pressing the Eject button until u see it's LED blink. That means higher speed has been activated.
Make sure u'r using a higher speed disk. I mean a 52x cos u won't be able to write at 52x on a 32x blank media.
As for reading media at slow speeds, that media must have been written/burned at slower speeds.
What are u'r drive models anyway?
I have a Sony Combo Drive CRX-320E & DVD-Writer DRU-800A each.