For steering DDW try using the following (3)three indicators,
that kind of 'check and balance' each other.
First, the bow wind indicator.
Second, pay attention to the feel on helm.
You can maintain a very slight weather to neutral helm with the sails stalled out.
If the helm goes a lee you WILL eventually jibe,
so push the helm away from you to get back to neutral helm.
If the weather helm helm increases pull the stick to get back/close to neutral helm.
Finally, with the jib strapped in (stalled) watch which side the jib FAVORS, as it oscillates
back and forth (how it behaves) out of the corner of your eye, and react accordingly.
This is useful when it is raining so hard you can not see the bridal fly.

In Kevin's picture you can see the crew let both jib and main out, opening the slot(lift),
increased sail area, etc. I have found offshore in squalls the shifts are gradual enough
to react, but ounce you get close to high land or on lakes geographical shifts hard to
anticipate/predict. Looking behind you, often helps, as you can sheet in before the puff (dark water)
hits you. Its fun watching the other boats go over next to you, as they let OUT their sails.
As for the kite perhaps someone else can enlighten us?