Ask a Bowman Thread.

Whys everyone still suggesting max SE so fast? Its only useful to get you into boss runs. I got SE to a long enough buff time and started on other things, seems more useful to go for raw damage over buffed damage.

A while ago I used some program a guy in SW made to plot out the SP distribution that maximizes DPS with Hurricane. As you can see, SE is a pretty low priority until you get the other two to 21, then it's distributed somewhat evenly. I would have left SE at 1 for as long as possible if I could, but level 1 SE isn't usable. I settled on 7.

 And here it is

Level: Hurricane, SE, Bow Expertise, Maple Hero

120: 1,0,1 1 Dragon Pulse
121: 1,3,1
122: 1,6,1
123: 3,7,1
124: 6,7,1
125: 9,7,1
126: 12,7,1
127: 15,7,1
128: 18,7,1
129: 21,7,1
130: 21,7,4
131: 21,7,7
132: 21,7,10
133: 21,7,13
134: 21,7,16
135: 21,7,19
136: 21,8,21
137: 21,11,21
138: 21,14,21
139: 21,17,21
140: 21,20,21
141: 21,21,23
142: 21,21,26
143: 21,24,26
144: 21,27,26
145: 21,29,27
146: 21,29,27,3
147: 21,29,27,6
148: 21,29,27,9
149: 21,29,27,12
150: 21,29,27,15
151: 21,29,27,18
152: 23,29,27,19
153: 26,29,27,19
154: 29,30,27,19
155: 30,30,27,19 2 extra points
156: 30,30,30,19

People mostly get SE to 29 early because they think they'll be needed for SE at some point for bossing or training with an NL or whatever. You really shouldn't max it early if you train with a non-crit-based class, though I know some who have.