Thanks, I have been wondering about this issue for quite a while, but have never gotten around to posting/asking. To quantify it a bit better, my Ecostar wattage actually floors closer to 35% with 141 watts...yes it does drop to 136 at 30%- max but obviously it has already reached its "flattened point" in the watts curve at ~35%. So actually, there is no efficiency advantage to running my Ecostar at less than 35% max (~1200 RPM).
You said you are in the process of rethinking your pump rates/times; there are a lot of programming options/variables/requirements for those of us with In-Floor-Cleaning-Systems...almost too many. I have been working on optimizing my schedule/usage since last summer and have still not yet decided on an exact timetable/rate. Experimenting (mostly for the sake of experimenting, haha) with my pool has become a new hobby. It doesn't look like you have automation, which can be used in conjunction with the VSP flow rates to improve efficiency as well...maybe in the future? Thanks again...