The reason why you have less space on your SSD is because Windows has increased the page file to 12 GB RAM and increased the size of your hibernation file to 12 GB. If you had 4 GB originally you will lose 16 GB off your SSD as each background service has taken an extra 8 GB apiece.
1) Reduce your page file to 2 GB.
2) Deactivate the Hibernation service and delete the Hibernation file. You will then increase your SSD capacity by 22 GB. People have not noticed this before because if you have a 1 TB HDD you will never notice the increased use of HDD capacity but of course a small SSD is going to show it up big time.