Hi
I'm surprised that you can boot your computer.
I didn't think that you could boot to a dynamic disk?
I mistakenly converted my Windows 8 drive to a Dynamic drive and it will no longer boot.
I was doing what you were, trying to expand the size of one of my partitions, and shrink others.
It doesn't really matter to me since I'm running Windows 10 which is on a different hard drive.
If I don't have to, I don't intend reinstalling 8, I'll just run 10 until the real one comes along and then do a clean install on the original drive after converting it back to basic.
But my research seems to indicate that I need to remove all the partitions, format the drive, and then repartition it to convert it back to a Basic drive format.
Then I should be able to restore Windows 8 on it from my system image file if I need to.
If you only have one physical drive, I would buy an external drive larger than the drives in your computer, and copy everything on your computer to it, before I did anything.
Mike