It is tempting to diddle around with your mix of funds. I have done it, sometimes in a mish-mash way--mixing Lifestyle Funds with S, F, and I. But be aware that your current mix of half G and half L fund (depending on the target date of the L fund) just concocts some L-fund hybrid, in effect.
If I were in your position and intending to draw down just $800 a month, I would consider, perhaps, putting all of it, at the least, in the L 2030 fund to be a bit more aggressive (the L 2020 fund is less than four years away from the Income fund, right, and that may be too conservative for your long-term prospects?). Of course, this depends on your own comfort level and what makes you feel right.
Remember, you'll be getting a pension (either CSRS or FERS, plus FERS supplement, if FERS, then FERS pension and social security at 62, if you choose to take SS at 62), so that, in a practical sense, is your "bond" fund, your lifetime annuity, so you can be a bit more aggressive with your TSP choices, if you so desire--just my two cents and based on what I myself do with my TSP-fund choices. It may make good sense for you to keep your TSP stash in the C, S, and I funds.
But, again, it's what allows you to sleep at night and that is the most important thing.
The good thing about the TSP is that you can decide one thing now and another thing in the future.