Kite speed contributes to kite power, and since about 2003 I have cut down kite lines to give 24 mtrs from the bar to the end of the lines.
On all the kites I have used the 24mtr overall improved the bottom end and top end compared to 30 or 27 mtr lines.
The bottom end was improved cos the extra speed linked the power strokes together better and eliminated the dead patch in between turns when flying the kite a bit for power, and the top end was better cos the kite would fly forward faster when needed.
Longer lines do slow down turning speed significantly.
I found that going any shorter than 24 mtr overall dropped of bottom end , significantly.
I have always ridden C kites, so bows or SLE's are going to be different.
On a kite that doesn't generate much power in the turns i.e. most SLE's and Bows ,longer lines might give more bottom end, cos for park and ride the longer lines keep the kite back in the window , more which will create more downwind pull.
I don't know where the Omega fits in with all the above, but you will be able to feel if the kite pulls in the turns or not.
Bigger boards that help generate forward speed resulting in more kite power will give way more gains than line length for bottom end.
Hope this info helps you sort it out , it can be difficult trying back to back, different line lengths in the same conditions ,to get a comparison of what is happening .
So the above is what I've found over the past 5 years.