Kudos to you Rusty. Stepping out of your cfort zone and trying something new. Congrats. Some people will probably cringe at this advice, but I'm going to give it anyways.
Next time, have a sharp knife handy. Skip the indirect and just throw the steak on over a single layer of lit coals. Put the top on and let it cook for about 3 mins. Remove lid, flip, replace lid and cook for 3 more. BTW, this presumes that your next steak is as think as this one.
After the 3 mins, take your knife and make about a 2 inch long cut through the middle of the steak. Long and deep enough so that you can open a bit of a gap and see the insides. This part is important. When cooking a steak hot and fast over direct heat, You really want to pull the steak off about 1 temp below what your desired finish is. If you want medium, then pull the steak when the middle looks mid rare. It will come up one temp while resting.
Also, while cooking, pay attention to the surface color. Also, press down on the steak with tongs or back of a fork to see how it feels at different points of the cook.
After getting a couple of cooks under your belt this way, you should be able to cook them by look and feel in the future, without taking a knife to the.
Once you can tell when a steak is done by look and feel, then mess with reverse searing or other techniques.
BTW, the feeling will be a little bit different depending on the type of steak, but again, knowing the feel will come with experience.
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