Ideas on my back workout

[sijun]

For back, I feel there's 4 parts.
1) lats
2) traps
3) lower back
4) mid back

As charles poliquin had said in one of his article, for maximal hypertrophy some muscle soreness is required.

The only time that my lats really sore was when i do 100 reps of BW chins in an hour. Doing the chins and other back within an hour is impossible.

For traps, heavy cleans really work them.

For lower back, heavy deadlift.

For middle back, rows.

My queries is should i separate my back workout. AM: lower back, mid back, traps. PM: chins 100 reps an hour. Or ideas how to make my lats really sore?

Any input in welcomed,

Sijun