I'm glad that you found the talon trainers notched it up a level Max. To answer your question from the previous post, the shoulder series can be done using a wide variety of arm positions. I'm surprised by your comment that you usually don't find this one challenging. Try to use a steeper angle and perhaps take your offset foot position and bring it closer together. You shouldn't have any problem making these movements light up your shoulders regardless of whether you've integrated the talon trainers or not.
Each one of the letters does hit the shoulder girdle a little differently. We have used the letter descriptions as part of the name as they loosely describe what the arm position looks like at the end of the movement. Below are some quick descriptions that hopefully will clarify things for you.
"Low" - Keep arms straight and do the action so at the end position your arms are slightly away from your body at thigh level. You will need to have a long or even use a stepping offset for this movement to feel right because it is so long
"L"- Low row your elbows into your sides and then externally rotate your shoulders keeping your elbows glued to your sides and a 90 depgree bend at your elbows. At this point each arm will form an L shape
"T" - Keep your arms straight and pull your arms wide and to the side at shoulder level to create a T shape
"W" - Very much like the L but this time you row to a high position and then externally rotate. Factoring in your head, you will have made a W at the end of the movement
"Y" - Like the T but reaching on angles overhead with straight arms... a little like the arm actions that go with the YMCA song... and don't tell me you've never done it because whether they wanted to or not, EVERYONE has at one point or another 
"I" - With straight arms take them right overhead
Try to cycle through 3 to 5 reps of each position with as little rest as possible.
I hope that some of this is helpful for you
Cheers