As always - it's what works for you. A good test of top leader's adjustment - put on the farthest out knot - try launching - if too hard or not at all - move in a knot - try again. Keep repeating til launch is doable. Should take a little effort, but the "in air" performance should be much better!
Try moving it out farther for more control - less speed. You may have to add a step back into your launch routine, but the extra control, once flying is well worth it! John's leaders are even longer!! Try out farther as it helps "square up" the sail to the wind, making it more efficient. Think having a ball in the center of the sail. As you move around, try to think about not dropping it!
Differences? Slightly different profile, more bow to the LE, deeper sail at the "V", panel layout designed for controlled stretch, etc. Sometime lay one over the other to compare. Not huge differences, but refinements to the design!
Interesting, mine is a standard 1.5 with stock handles and leaders. I thought it was quicker than Dr.Zenttls B series and a little less stable. I think our comparisons mybe askew as we were both being very tentative flying the others kite. I will be changing the leaders on mine soon. Could anyone tell me what other differences their are between the B series and the 1.5?