Personally, I'd reduce the brine time on a cut that size. 12+ hours is good for a full packer (12+ lbs), but I'd do a flat that size about 8. It's not the amount of curing salt in a gradient brine, it's the length of the swim. If the brine penetrates about 1/4", it will have done its job. A brine, unless you're actually trying to cure the entire piece, like Canadian bacon, only needs to penetrate the surface a small amount to modify the protein molecules so it holds the moisture inside. Just my 2¢... Still looks great!
One more thing about length of time - since you aren't controlling the amount of salt, like with an equilibrium brine, too long of a brine time can really affect the saltiness of the interior meat, if it penetrates too deep.