<human>: I think I know the right thing to do here, but I want to double check. I'm rereading the Bogleheads' Guide to Investing now that it makes more sense to me, but I think I already have the answer.

I'm 27 years old. I have a Vanguard RIRA, and a 401k with Principal.  Last year, I was contributing to Target Retirement Date style funds with both, but I discovered that those funds with Principal had a high expense ratio. So, I moved all of my 401k capital into the low ER index funds, but they're all for stocks. 

This messed up my asset allocation, which was already aggressive as it is. I went from 90/10 to 96/4. This has been great in this bull run, but it's more aggressive than I think I want. 

Now I don't understand a lot, but I have heard that bonds typically move in opposition to interest rates, and since interest rates are so low now, it's not a good time to buy bonds. HOWEVER, I also understand that the ideal strategy is to pick my asset allocation based on a long term strategy and then stick to it, and this issue of me rebalancing back into bonds is a form of me trying to time the market. 

So clearly the thing for me to do now is to move my funds at Vanguard into a different Target Date fund with enough bonds in it to meet my desired allocation, correct? The logic being that even though this might not make sense now, I should move to the correct allocation for my strategy now and hold it long term, especially since during the next bear market I'm going to need to know I'm sitting where I need to be and to stay the course.

As I said, I could be completely wrong on some of this stuff, but this is my understanding, and I'm reading and doing research on my own to figure it out, but I'm feeling like I need to move to fix this situation soon. Thanks for reading!

Can you provide a brief overview of the text?
<bot>: I'm overweighting stocks in my portfolio right now, should I rebalance now to buy more bonds, even though bonds aren't a great deal at the moment?