Airborn weight requires lift which also creates induced drag. The lift expended in this regard subtracts from the total available for 'performance.' This is most notable in how far a kite will fly to the edge of the window (and remain there in a stable way) which is a direct measure of light air performance. Suggest you attach a 'few kg's' to your kite and try it. (actually a few tenths of a kg will make a difference.)
Peter_Frank wrote:The weight of the kites are interesting in other respects, but for "light wind" perfomance, I cant see any relevance whatsoever !
So a difference of a few kg's wont make any noticable difference at all !
I am 100% sure that the mass wont make much difference, regarding KITING in light wind.