The knots on the bridles, or on the pigtails connected to your lines on bow style kites really are quite obsolete.
The reason is that there is a huge amount of trim range available at the bar, and with the trim strap/cleat.
The extra inch you gain at the kite makes little difference, except in extremely strong winds (when if you need the extra inch, you should be on a smaller kite) or in light winds.
The extra inch really only makes a difference to the girls, so I'm told, I think one of my sons mates wrote a song about it, or maybe it was a video??

Just connect all 4 lines to the middle knots, thats what I do, I never use the different knots (even on C kites).
Cya and
Goodwinds
Steve