Re: Curtis B mode
Nice video demonstrating the speed advantage of iambic keying. But I couldn’t find anything there that said why Iambic A should be inferior to Iambic B.
Interestingly, all the high speed champions prefer single paddle over iambic. Why? Because of its greater tolerance to errors in micro timing. I wrote about it here, as it has helped me send more error-free code also - http://la3za.blogspot.com/2013/06/the-advantage-of-single-lever-paddle.html
Try them all, and choose for yourself!