I hope I don't get called out for thread bumping but here is two months later.....I'm pretty consistent with my practice routine.... Maybe that is the issue .... Need to switch it up.
Check out Revelation Dai Vernon. Under "present day developments" has some pretty cool stuff even if it's not the official Steven's Cull. It is called The Cull Riffle of the Mysterious Kid......Let me know if this helps. :)
I remember doing a trick for a magician and a lay folk a couple of weeks back where I had one of them call stop he landed on the 6 of spades, and then I spread out the cards and had the magician pick out the 6 of clubs..... Neither of them knew if I intentionally forced the mates on them...