Welcome to Windows Seven Forums.
Have a read here: Windows 7 How do I cleanup winsxs folder to free up space on SSD - Microsoft Answers
It would appear that if you try and compress or delete files from the WinXsX folder you can render some of your applications unworkable.
With today's large spinning drives, allowing this folder to grow doesn't cause a problem, but with much smaller SSD's it obviously does.
Other than getting a larger, more expensive SSD, I'm not sure what the answer is, if indeed there is one.
One of our experts is sure to have the solution if one is available.