Are they more or less stable when linked like that?
Here's a pic from last winter flying over the ice on lake Nokomis here in Mpls. This is a 55, 35, 25 ft. progression.
I've found placing the smaller kites in the back of the stack helps to give lift to the larger dragons in lighter winds. They can be very active depending on how the wind is blowing, the trailing kites doing a nice dance with the 55 acting as an anchor.
A bid of vinyl tape above and below the prusik knot keep it from sliding out of place...
I was asked to clarify about the link lines. I placed them about 1/3 down from the top of the spine. This configuration is good to about 15 mph. I'm looking at beefing up the spines on the 55 and 35 fters to prevent them flexing out of the pockets in higher winds.