Our new tandem has carbon fiber drop handlebars.

It seems like the length of the bar ends is shorter than I like. When I get down on the drops (not all the way forward in the curved section) my hands are at the very ends of the bars.

I've looked at specs for various bars and I don't know what defines this dimension. I don't think that it is "drop" or "reach".

Any idea what defines this dimension? Are there bars where this section is longer?

Thanks in advance.