TRIM is on-the-fly.
Without TRIM, a file delete would just remove references to the file. The chunks of this no longer used file sits on the SSD and cause a performance hit when the SSD wants to use them in the future
With TRIM, a file delete tells the SSD to read the block into cache, remove the deleted pages, and write back the cleaned block.
Also, you do not need to run SSD Optimizer everyday. Intel SSDs are already resilent. For a desktop user without TRIM, you probably can run it once every month.
There is one additional suggestion. (DuckieHo might not agree, in which case I would defer to him).
Given that the fact that your server will be putting up considerable strain on your SSD you could change your primary partition to a smaller size (80%) of your capacity. This "unused" extra space would give your drive an additional ability to handle the constant read/write activity on your server.
free space helps, but it is not necessary for the free space to be in a separate partition or in unpartitioned space on the drive.
just don't fill the drive up and you'll be fine.
p.s. game servers are generally not heavily i/o bound.
Yup, there is no need to hard limit the partition. The SSD will use the space accordingly.