STAR is a balanced fund, 60% stocks/40% bonds.
Target retirement 2055 is a lifecycle fund that is currently 90% stocks/10% bonds.
First, you are damn lucky to have those funds in your 401k because they have very low costs - and it's costs that matter in the long term. If a fund has a 1% expense ratio, after 30 years you have lost 30% of your money. Vanguard funds are among the lowest cost funds available. So good for you that you have Vanguard options in your 401k. Just as a comparison, the option in my 401k that is closest to your Target fund has an expense ratio of 1.2%. If I was invested in that fund for 30 years, 36% of the money would be lost to expenses. That's almost 7 times more cost than your Vanguard Target fund.
If your money is split between those funds equally, I feel you are on the right track. I'm a firm believer in the Bogleheads style of investing and recommend a great book called The Bogleheads Guide to Investing.
Spungo, your example is like the useless exercise they make kids do in school where they pick stocks and see who did the best... in a month. Let's focus on long-term investing which IMHO ought to be based primarily on index funds proven to outperform both actively managed funds as well as the vast majority of portfolios of individual stocks. You might be the 1 in a million who can pick stocks time after time, knowing when to get in and get out, but let's assume the OP is not as brilliant. No offense to you or the OP but the odds are none of us are brilliant stock pickers for the long term. I know I'm not, and index fund investing, asset allocation and periodic rebalancing has done wonderfully for me over the long term.