That's a good question. Maxed Marksmanship is a 1.02x increase in damage while training. Should be a slightly higher priority if you either boss/intend to boss, or desperately require a little bit of HP. It'd require some more number crunching, but I'm feeling that getting some Expert and then a decent SE timer while staying on 1 Hurricane, and then maxing Expert and then SE is more beneficial unless there's some specific single target training (LHC) available where Hurricane would take priority over maxing SE. I think Marksmanship can come after this point because in terms of damage-skillpoint efficiency, Marksmanship isn't particularly good.
On normal monsters with 10 PDRate, you gain a 1.02x increase in damage for 10 skill points. On Zakum who has 40 PDRate for example, you get a 1.13x increase in damage for 10 skill points.
1 vs 11 Hurricane is a 1.14x increase. 20 vs 30 Hurricane is a 1.11x increase. etc.
20 vs 30 Expert's minimum damage increase is 1.03x increase, plus it gives 10 watk, and 5% more critical minimum which is more beneficial when you have higher crit rate from SE
20 vs 30 SE is 1.20x increase with no Expert, and with maxed Expert it's a 1.19x
There's some other small factors involved, but I just don't see particularly good efficiency in it.
On normal monsters with 10 PDRate, you gain a 1.02x increase in damage for 10 skill points. On Zakum who has 40 PDRate for example, you get a 1.13x increase in damage for 10 skill points.
1 vs 11 Hurricane is a 1.14x increase. 20 vs 30 Hurricane is a 1.11x increase. etc.
20 vs 30 Expert's minimum damage increase is 1.03x increase, plus it gives 10 watk, and 5% more critical minimum which is more beneficial when you have higher crit rate from SE
20 vs 30 SE is 1.20x increase with no Expert, and with maxed Expert it's a 1.19x
There's some other small factors involved, but I just don't see particularly good efficiency in it.