1. Don't worry, you're fine, 5% or even 100% made once do not reduce lifespan of your ssd. But don't do it again.
2. Don't try to improve things too much. If something works fast (in SSD case mostly as fast as possible) - leave it that way.
3. SSD lifetime is very long. Well, maybe not very long, but after 3 or 5 years you'll have probably completely different drive and forget about current one.