mumu Awesome! Happy to hear you're enjoying it. Yeah, I couldn't figure out how to integrate Frey's with this build and have it not feel clunky. It definitely has more damage potential, but it doesn't feel nearly as good. Luckily, you can use Frostbite Shackles or Mourningfrost to supplement the same stats. The one thing I'd like to test more in 1.0 is making the mana spikes smoother, like you said. This should also iron out some defensive inconsistencies, allowing you to cycle skills more often.
In higher corruption, sorc also has some really useful nodes dealing with mana regen and capitalizing off of large amounts of mana spent. Endurance + endurance threshold + armor seemed to be really low-investment, high-payoff stats for this build as well, since its glaring weakness is the ability to sustain damage spikes and recover quickly.
Definitely will check your link, and I'll get to updating this guide for 1.0 once I finish this really interesting Warlock build I'm working on 🙂