Um it is a lot smaller than mine, but I'm certainly no expert on the subject. My configuration looked very similar to cakers low mem config so I just altered all my values to the much lower values that the example config had in it and it really helped.

As for whether you should just add those entries, I'm not sure, I can't see why not, but I don't want to point you in the wrong direction, you could back up your existing conf file to my.conf.bak and try a new one, if it didn't work just revert back to the old one untill someone can give you a more definitive answer.

Cheers.