You seem to have trouble interpreting basic strategy charts.
When a strategy chart has two options listed, that should be read as "Do the first option if possible, if not, do the second option". Doubling is usually only an option on the first two cards. For this reason, you'll see entries on a strategy chart of D/S, which mean, "Double if you can, otherwise stand". If there's only a D, that always means "Double if you can, otherwise hit". Most doubles are of the double, else hit variety. The soft 18s are the exception, hence the D/S terminology.
Surrendering is similar. You'll see R/H or R/S. For example 16vT is a R/H, while 17vA is a R/S in a H17 game.