Secret rates have nothing to do with the amount of Primes a set should have. Look at the Arceus set. It had a total of 12 secret rares, and still had 6 Lv.Xs. They also had 9 secret rates in Rising Rivals, but had like 10 or 11 lv.Xs in that set too. So, just because a set will have a bunch of secret rares, that doesn't mean it will change the number of primes that we will get.