I did a quick check in the sheet with my gear against a
1/15/55 spec. I took out all the glyphs except for explosive shot and checked the damage benefit for adding each one. This is what I got:
70.83 - KS
48.86 - steady
44.81 - hawk
41.86 - serpent
27.81 - aimed
I expect some of the glyphs do tend to affect how much damage benefit the others give, so take the numbers with a grain of salt.
I would also say that if you have a fairly high amount of haste (and are typically in a raid with someone providing the haste buff), you may do better moving that point from hawk to hunting party or imp stings (or even focused aim if you have enough hit gems in your gear to see a benefit from switching them out). For my gear I'm finding the imp hawk talent to not perform as well as the alternatives.