I noticed in the wiki that it says if you have not unlocked EX mode for cards that if your N cards are maxed it will raise R and SR cards.

However I have not unlocked EX mode, my N cards are all maxed, and while I do think I see a random R or SR card raised once about every 20-30 spins *usually more*, all I get are N wild cards. This certainly does not seem easy or quick, and almost a waste. Am I doing something wrong or is that the norm? Is it better to just unlock EX mode now?