The next to largest sprocket is considered to be perfectly useable, so you shouldn't expect the sequential program to shift any sooner. It can't be changed either. Personally, I'd never use the sequential or compensating modes. They can cause chain drops with unexpected chain ring shifts. I only set a 2 sprocket limit when I hold the shift lever. I want complete control of my shifting. On a fast approaching climb, I might shift from the big ring to the small and want no compensating shift done for me. I also don't like the 13T chain ring difference, so I use a Campy chorus 48/32 or Shimano grx 46/30 crank to get more range. A 2T compensating shift is usually what I need.