Swift Step 15 is a given. Multishot 15 is a given.
Oblique Shot and Heavy Shot should probably stay at level 1 forever, because the small damage increase isn’t worth the SP cost.
That leaves Twin Arrows. From what I understand, this skill hits twice, once for 100% + skillAtk and once for just 50%. If that’s the case, it seems like it would still be worth keeping at lv. 1 for the reduced SP cost, since it’s 5 Overheat and the attribute would have slightly better scaling than on other single target skills (because of the 150% per hit). That is, if I’m not mistaken as to the mechanics here.
EDIT: Twin arrows does 100% + SkillAtk and has a T1 modifier of +100%. The actual numbers displayed on each hit are random proportions of the actual damage dealt.
So basically I’m left with two options. Kneeling shot to 10, ending with 2 in twin arrows - or keep kneeling shot at 7, and have enough points sitting around to 5/5 twin arrows.
I’m just not sure it’s necessary to max twin arrows. Thoughts?