what range are you giving the CO after he calls your 3bet?
remember he's a 19/16 reg.
if, like me, you assigning something like: TT+, AQs+, we can easily bet this flop. vrs even that range, we are a 64% favorite on that flop. the more suited A's you add, and the more PP's you remove, the less our equity becomes.
if we cbet, and get raised, we can assume he's either got an Ax or air (if he's a smart reg, one can easily c/r as a bluff here), and we can easily fold (most likely have more Ax's than air). and if we get called, and he checks turn, we can either double barrel to continue to represent strength, or check for pot control and see a river card. i like checking for pot control more than double barreling based on his 3bet calling range + cbet calling range, against a villian like this.
i.e. we can double barrel more in spots like this vrs this guy if we know he will most likely raise the flop with his Ax hands in 3bet pots. but if he's tricky, then i like checking for pot control more.
if we check the flop, we keep his worse hands in his range, but at the same time, we dont actually reduce it either. so, if he checks again, we can bet / fold, or continue to check and see a river.