Currently you're using vnew which is fine but it takes up half the available screen space. I think it could be more intelligent and create a new buffer from the width of the open buffers.
For example if my open buffer is:
└─ home
└─ joe.reynolds
└─ code
└─ helloHeaps
└─ 7-scrolling-camera
├─ ◎ Main.hx ⇒ 1
├─ • 50 ⇒ 8
└─ • Player.hx ⇒ 5
Then really, the width should be the longest line on this buffer (I think 34).
It'd make sense to constrain this too so you don't get ridiculously small or big buffers.
Just a thought