I've been working as a server admin to optimize MySQL databases for many customers.
I can take a look at the server and try to find the main queries which are causing the high CPU load, identify them and tell them to you, so you can optimize the queries.
My rates are usually higher, but since I have just joined Freelancer, I would be happy to do it for you, so if you were satisfied with my service, give me a good rate for my profile.