As sometimes happens with big plans, things change. As it turns out, card numbers 17, 19, 20, 21, 25, 27, 29, and 30 were never published. So you had most of them and only need #11 from issue #18, and 12 and 13 from issue #25 to complete the set. The cards were all published on the back cover of Captain Marvel Adventures #15-26. Somebody must have liked them, because beginning with issue #76, two cards were published on interior pages, usually of the same character. These cards were smaller and on inferior paper. I know they were published at least through issue #86, but they were less interesting to me so I didn't check any further.
Many thanks Rich. That REALLY makes a difference. It is an interesting set that I would love to complete if I can.
Cards are also on the back of Spy Smasher 7 and Whiz 35 but they are cards you already have.