Whatever allows you to sleep at night, my friend.
If 80:20 Equity/Bonds ratio of VASGX is too risky, then 60:40 of VSMGX Moderate Growth may be your best bet.
Note that, according to the Vanguard website, since inception of both of these Mutual Funds, the difference in average annual returns for both is only 0.45%, which I find interesting.
If you need "access to some of my funds" in the next five years, than you either need to save up a separate "transition fund" and put in a high yield savings account, OR, take some money off the table right now and also put that in a savings account or Vanguard money market.
You will lose a bit in long term returns if you place some investment money in transition reserves, but that's okay, as you have said that this transition will allow you to retire sooner.
Congratulations!
JGS