Thanks for your email.
The loss of the speed setting in KProbe is usually due to your DPI setting not being set to normal size (96 DPI). You will find this under Display Properties/Settings/Advanced. This will also reduce the size of your saved scans.
Because of the replies by other members in this thread, I will not delete the thread, as you requested, but I will close it to allow you to start another thread with the new scans at 4x instead of max.