A) There's no such thing. You're just tall and on the skinnier side.
B) You have a great general structure and, objectively speaking, seem naturally suited to having a muscular build with wide shoulders and a small waist.
I disagree. I took the liberty of throwing these together based on pics you posted in your other thread. If you want it removed, let me know.
Now, the first pic is a crappy angle, but you said that was 160 pounds on the left and 188 on the right. So almost 30 pounds gained with basically zero body fat added. Like some of us said in your other thread, just stay the course, bump up the patience
, and keep going.
As far as routines go, an upper/lower split can be a great way to hit everything twice a week. Take a look at Blending Size and Strength by Clay Hyght or Big Boy Basics from Chad Waterbury, or this routine by, um, me.