I assume that if you have TIAA you're in education. I have TIAA also.
First of all, make sure you're looking at the proper classes of funds. Most people who have TIAA through their employer have access to different classes of shares with lower fees than what you are quoting.
Secondly, take advantage of free advice. Sit down with an advisor when they come to your office. Understand that unlike some other fund families, TIAA people are not earning commission for buying and selling certain funds or churning. Vanguard is a fantastic company, but TIAA is in the top 5, I would say. They have some services you may find valuable later in life, when you are on the cusp of retirement.
Thirdly, you can open something called a "brokerage window" within your TIAA retirement account which gives you access to many other funds and fund families. This may be an option for you if you want to diversify outside of TIAA.