Sure how about -2 tendrils +2 duress? *FIXED. I was also considering Lighting Bolt now that im splashing red because fish is one of the toghest match ups and if not killing medeling mages It could be used to push that little bit of damage through if your storm count was to low. Well mabie for sideboard.
Nah, just use Massacre in your sideboard to handle Mages and all their other pesky fishies.
Have you tried using ETW as your primary kill rather than Tendrils, because ETW allows you to win off a mini-storm, making the kill more consistent. With Repeal, 8 Rituals, and all that other accel, creating a storm count of as little as six seems easy, and that is usually all you need to win, however, it will take another turn or so to finish them.