Surecast could use a buff.

[Vejjiegirl]

Or just make Surecast's effect lasts the entire duration of the skill instead of just fading as soon as you use a skill

That's what the PVP Skill Equanimity does, while the buff is up you do not get interrupted and it doesn't vanish on one spell use like Surecast.
Surecast should be a lot more like Equanimity.