Mashing confusion

I’m not saying don’t do it your way, but you need better reasons.  The main reason I use nutrient is for the trace minerals, step mashing isn’t going to increase those.  Alcohol content and body are closely dependent on each other for a given grist, and what you’re describing can be achieved by changing your single infusion temperature and/or time.  Also, you’re using the same amount of water to batch sparge, unless you’re saying that step mashing reduces the amount of water the grain absorbs.  And with more water in your first batch sparge, you’re actually more likely to extract off flavors, not less likely.  The efficiency might be your best selling point, but are you sure yours is really that much better than a single infuser?  I’m not convinced.