The best edit of that I've scene so far actually worked because it removed Anakin's overwrought regret - "What have I done?". Without that line alone, it really does sell the whole thing better, and makes it seem less sudden, like he's been building up to it (which he had)
There's probably not a great deal else that can be done, but for me that simple edit alone made a massive difference. The regret line was completely antiproductive to Anakin's fall.