Well, unfortunately I gave up on the Powder Foundation which makes me sad. I kept getting serious oil slicks and it was making me nervous that it was the moisturizer, etc. But it was definitely this. I went without it for a day and could tell a difference then skipped a few more and had no oil slicks. I thought the heat was impacting it but it didn't seem to be making enough of a difference.
So today I returned it. But so far so good on the rest. The lotion might be the best item of them all.