I’ve been using LRS since 2015 and have only experience increased foam a couple times, but that’s because of the amount I fed. For those wanting to set up amounts for tank sitters, just break off what you would normally feed and place those chunks in a ziplock baggie and keep it in the freezer. I usually try and break off smaller chunks for those who are feeding in my absence. I also instruct them to use two smaller pieces (if I break off a couple smaller than normal chunks) to make a normal size. You can use a knife to make precise pieces for your sitter.
As others have mentioned, don’t rinse this food, it’s completely pointless. If your skimmer is reacting, try reducing the amount and feed smaller portions throughout the day (which is what you should be doing anyway).