It is interesting that you are using low-foam nonyl phenol ethoxylate as your emulsifier and you are having foaming issues. Yes, you are right, you have a few options for lowering the foam further: 1) you can add a 'moisturizer' in the form of a non-allergenic oil, 2) you can use a defoamer, and/or 3) you can use an antifoamer.
Adding an oil reduces the foaming tendency (depending on the type of oil, it can act as both an antifoamer and defoamer)
Defoamers lower the foam that has already formed. There are some different chemicals (typically based on the Si molecule) that are available to you.
Antifoams prevent the foam from forming in the first place, and are present in quite a varitey of forms, prices and quantities.
You have quite a few options.
I hope this helps you out.