A few other tips to save characters:
No need to add "s" to words (plurals), or " 's " to words as the search tool ignores them.
No need to repeat title words, added automatically and invisibly by GCU.
No need to include your category name, added automatically and invisibly by GCU.
There likely are a few more things like this. I went through this with Shaun last Spring; it was rather interesting.
The keyword field is 256 characters wide, which is a commom "sacred" computer value as it is 2^8. I think we may need to live with it, but using some of these other tricks you can likely get done what you desire. I'm impressed you use the full 256 characters! Probably is one of the reasons for your success, besides your awesome cards!