No I'm comparing pure pve MM builds. For Surv both show that +8 AGI > 16 AP for example. But for MM Lactose: 16 AP > 8 AGI but yours other way around. Thats what boggles me. The difference isn't minor.
What I'm using is comparing the dps change compared to no socket, 8 agi socket and 16 AP socket and see the ratio between the difference. While Lactose's table already have in installed (*hint* wish list

) And shows it I had to do it manually.
I actually just noticed you are using new Imp mark (440 rap) so I put it in Lactose table. I notices there is a huge difference about fighting 0 mitigation mobs (not using arcane for rotation) So I entered 32% mitigation for both tables:
Lactose: 1 agi = 1.66 RAP (Straight from table)
Using Cheeky's (Data for hunter only)
+1 AP = 0.183758864 dps
+1 AGI = 0.380008956 dps
AP to AGI ratio: 2.067976194
Merged with pet dps:
+1 AP = 0.205799736 dps
+1 AGI = 0.439491411 dps
AP to AGI ratio: 2.135529521
As you see HUGE difference.
Now here is something interesting. Removing all mitigation from all calculations (Make Cheeky spreadsheet remove Arcane shot from rotations, and do that same to Lactose by forcing rank 0 on the shot)
Lactose 1agi = 1.84 rap
Cheeky (hunter only) 1 agi = 2.068073999 rap
Cheeky (Merged with pet) 1 agi = 2.135723783 rap
This is more inline.