First, a two-speed pump will DEFINITELY cut your electric bill. I don't remember the exact numbers, but usually you can run it on low speed about twice as long for about 1/3 the cost. And it will run SO much quieter! I've had a 2 speed pump on my pool since Day 1 and would never be without one again if I have my druthers.

Second, where are you maintaining your FC level? And what is your CYA level? You can run an SWG pool at much lower levels for a given CYA than a regular pool. As WaterBear says, for a CYA of 100, you can run your SWG at 5ppm, rather than the minimum 8ppm the "Best Guess" table calls for.

Is your salt level sufficient? Your SWG shouldn't be running any longer than it needs to achieve the dialed-in FC level.

Post all your numbers and maybe we can see places to make your life easier and let your system run less.