Playbooks

Ace Slot Offset is Shotgun's 12 personnel answer to defenses that want to sit in base and dare you to throw. You get two tight ends, one attached and one flexed to the slot, with a single back offset next to the quarterback instead of directly behind him. That offset alignment is the whole point: it changes the run fit angles for Inside Zone, Outside Zone, and 0 1 Trap while giving the back a cleaner release path on HB Slip Screen without needing a pre-snap motion that tips your hand.
The set separates itself from standard Shotgun Ace looks by putting a tight end in the slot rather than a third receiver. Against man coverage, that slot tight end is almost always drawing a linebacker or a big nickel safety, and that is a mismatch you can attack immediately with Stick, Levels Y Sail, or a hot routed slot option. Against zone, the same body works the seams and the hook window while your outside receivers clear coverage on Posts, Smash, and PA Y Corner. The heavy personnel also keeps run fits honest, so the play action shell games (PA Verts, PA Scissors, PA Post Shot) actually pull linebackers out of their drops instead of getting ignored.
What makes this set a legitimate scheme hub is the RPO package. RPO Alert Bubble, RPO Zone Alert Bubble, and RPO X Smoke all read the box out of the same look, letting you hand off against light boxes and throw the bubble or smoke when the defense stacks. Add Read Option and Flood off the same personnel and you have a set that runs, throws, and reads without a single substitution, which keeps opponents from packaging their defensive personnel against you.
Read the box count before the snap. Six or fewer in the box means take the handoff on RPO Zone Alert Bubble and Inside Zone. Seven or more means throw the bubble or the smoke.
Use PA Verts and PA Post Shot only after you have established Outside Zone and 0 1 Trap in the same set, otherwise the linebackers never bite and you are just holding the ball against pressure.
On third and medium, run Stick or China Double In and read the slot tight end's leverage first. If a linebacker is aligned inside, hot route the tight end out and take the easy pitch and catch.
Against Cover 3 and single high, go to Flood or Post Wheel Shallow and work the sideline high low. Against two high, Posts and Smash attack the seam and the corner void respectively.
Motion the flexed tight end tight to identify man versus zone, then get back to the concept you want. Just do not use it every snap or you telegraph the RPO reads.