[1.2.133] Archer Jump!

Mmk.
2441 DEX
203 STR
27275~32000

2457 DEX after Illusion Step.
28597~32044 after Illusion Step

31590~37165 after Concentrate

34503~40606 after Spirit Link 4.

1.25(4*2341+203)*WepATT/100 = 32000.
Around 267 weapon ATT.
(from what I can see, the quality of the video is sh`it tier tbh)

So what does Spirit Link do then? It's obviously not +20% damage because damage doesn't mean attack. Attack and AP are the only things that can affect the damage range directly. Level 4 Spirit Link gave 4% "bonus damage"
267+25 = 292 + 8 = 300 * 1.04 = 312 wep att.
1.25(4*2457+203)*312/100 = 39120 top.
Where's the extra attack coming from?

Level 4 is actually 7%. So:
267+25 = 292 + 8 = 300 * 1.07 = 321 wep att.
1.25(4*2457+203)*321/100 = 40,249 top.

In his stat window he's at 40,686ish or so, so picking up that extra couple hundred is a lot easier to finagle (rofl, not red underlined) from somewhere than your calculation.

And btw, the 4% is the bonus to w.def and m.def.