Is SkillSpeed too weak?

[Endariel]

Tbf, if not for Senei and Ikishouten, SkS would probably be the best SAM stat by a significant margin. All other sources of damage are affected by SkS, and at 216 per % expected damage increase compared to Direct Hit's 240. (Crit sucks until the high 3000s alongside high Direct Hit, or early 4000s if one has no Direct Hit.) Higanbana and auto-attacks will be affected less by SkS than Determination (254 stat per % vs 250), but as must of SAM's damage is GCD based or generated from GCDs without further bottlenecks (e.g. Shinten/Kaiten), it's a competitive stat at 1/9th more efficiency than Direct Hit.

Well, according to the balance, 28 gcd rotation is more effective than 29 and 30 gcd rotations.

So no, not really. Also, sams need to hit the right tier of sks to perfectly align banana reapplication, midare with meikyo, and tsubame gaeshi, not for senei