Hello First Wave fan.
First, are you using the KDE control center software to create these changes? The name of the binary is kcontrol. If you are not using this to set changes in KDE then give it a try. Make sure that you press the "Apply" button after making a change.
All of the things that you mention are controlled in two places. First there is a system wide configuration for X and for KDE. These have default settings. You can override these settings if you have your own copy of these files in your home directory. Check to see if you have the following files and directories in your home directory.
The .xinitrc is a normal text file. The rest are directories.
$HOME/.xinitrc
$HOME/.kde
$HOME/.qt
There may be more configuration files for KDE in the $HOME directory. I use several window managers so my $HOME directory has directories from those other environments.
If you do have at least the .xinitrc file in your $HOME then make sure that your account has read/write access to the file.
If you don't have the .xinitrc file in your $HOME directory then you can copy the system's default file from /etc/X11/xinit/xinitrc. Notice that when this file exists in your $HOME directory the name starts with a period but the copy in /etc/X11/xinit does not have a period at the beginning of its name. Once you copy the file to your $HOME directory you have to be able to read and write to the file. That should be okay since your account created the copy but check anyway.
The settings that you listed are not controlled in the .xinitrc file but it is a starting place to configuring the behavior of any window manager. The settings that you listed are stored in the $HOME/.kde directory tree, and maybe in the $HOME/.qt directory tree.