Frying temp has to reach 375* minimum. That's the temp that will render the skin well and crisp it.
I suspected as much. Actually, the whole project was somewhat of a flop. First of all, I used an off-the shelf creole butter injection which was not very good. My DIY version was an order of magnitude better. Secondly, the breast were done perfectly but the dark meat was way undercooked at 168°. This was probably the last whole turkey that I'll ever cook. In the future, I'll separate the breast and quarters. Cook the breast to 155° and the quarters to 185° in order to fully breakdown the tough interconnecting tissues. BTW, the dry brined version was much better than the non-brined.
I know it sucks when things don't work, as I've had plenty of birds that were not good. On the other hand, now you know what doesn't work, so you can check that off the list, so that's a good thing.
Don't know if you want my input, but here goes...Try no injection. Instead, season the bird and put in fridge to dry brine for 3 to 6 hours. That's a must. Pull it out an hour or two before the cook, to room temp it. Just before the cook, pour the boiling water over the bird in the sink. Its good if it's spatched, cuz it can lay in the sink on a grate, when you pour the water over the skin side. You'll see the skin go translucent. Pull the bird out, then re-season, spray a lite coating of oil on the skin, then right into the cooker at 375* to 400*. When breast reaches 171*, check temp of thigh. Thigh is usually much higher temp than the breast is, like around 180's, but I just make sure it's above 165*, so the dark meat is safe. But like I said, it's always well above the breast temp.
Just try that exact method once, to make sure it all works for you in that sequence. Once you do establish that as a working method, then you can try one different thing at a time to see if it works too or doesn't work. So far, those who have tried that method have had success. From there, you can make it your own. Really hope this helps. Let me know...thanks.