Lack of water will most always show on the bottom first and then work up to the top dropping the oldest leaves first. Lack of water will show signs like said above in 10 days and you don't have that problem. The other possibility is too wet of soil or lack of oxygen in the root zone. The third possibility is you burned the plants with too much liquid fertilizer by dropping the pH in the root zone when you drenched them.
Since you have 3 possibilities you will need to dig one up very gently and investigate the hole and the rootball, and see if its sopping wet or bone dry or neither. Be sure to look at the plant when you dig it up and look at the base of the plant and see, if you planted it too deep in the soil? Most problems occur from a shrub or tree planted too deep in the ground. Most nurseries plant them too deep for management reasons and home owners bring them home and plant them too deep. Now all that being said, it looks like to me you have planted too deep and the excess water you are giving them can't escape. Plant them high like a ant mound for the best drainage.
