I inject anything over 2" thick. I think you are right that the brine would probably make it to the center of the loin but there is time and effort put into it so I want a good final result.
Thanks Woodcutter. I finally trying my own, just put it in the brine a little bit ago. I didn't have any molasses so I used some Vermont Maple Surple (as my Dad always called it).
I figure if the cure penetrates at 1/4" per 24 hours, a 3" thick piece being completely submerged technically should only need 6 days if being absorbed from both sides. I'm no expert by any means, but seems to make sense to me, I will however leave it in for the full 12 days as you did, just not injecting. It is only 3.5 lbs for this first experiment, so we'll see. Thanks for the insight, I'll follow up when it is ready.