My system was set up with 10-12 gallon batch-sparged batches in mind. It's a 17-gallon kettle and a 70 qt cooler. However, lately I have been brewing more 5-6 gallon batches, which has led me to trying out the "no sparge" method, since I had extra space in the mash tun. Anyway, I got the idea to try a hochkurz mash since I noticed that I was waiting longer to heat up my strike water and because I recently had success with that process for lager brewing. The trick has been water chemistry - I am using brunwater to calculate the strike water, then calculating the complete water profile.
I am using about 1.35 qt strike water per lb of grain for the first rest, then the rest of the necessary water for the second rest.
The goal is 144F for 40 minutes, then 158 for 30. Since I have less water to heat up the first time, the net added time is maybe 5 minutes from a standard no-sparge and 10 minutes from a standard batch sparge. I'm still determining what, if anything, this adds to my beers, but I am getting good attenuation. Does anyone else do anything like this?