I figured that you would be making the combined offspring dough in your home mixer, for the reasons you mentioned. However, if the dough works out well using your home stand mixer, I would imagine it would work out equally well in your Hobart mixer at market.
Thank you for clarifying how you handle the wet dough, including use of the warming cabinet. I either didn't know or forgot that the dough that you place in the warming cabinet is in bags. I also went back to the Two Bill's thread and refreshed my memory on how you handle the wet Detroit style dough. The posts where that is explained are Replies 2005 and 2006, starting at http://www.pizzamaking.com/forum/index.php/topic,21559.msg264715.html#msg264715
. With the foregoing in mind, I am inclined to believe that the reason why the offspring doughs you have made to date are not sticky is because of the methods you described in Replies 2005 and 2006 where you describe the use of the two-step mixing process with a rest period in between, which strengthens the gluten matrix and improves the hydration of the flour, the use of multiple folds, which further strengthen the gluten matrix and makes the dough less sticky and, finally, the use of bench flour that further mitigates the stickiness problem but without materially lowering the hydration value of the dough. Also, when you merge such a piece of the dough with a piece of dough with a lower hydration value (a piece of the Boardwalk dough), the overall hydration of the merged pieces of dough will be reduced to something in between the hydration values of the two pieces of dough. I would think that such a merger would render the final dough even less sticky or tacky. In your most recent example, that intermediate hydration value was just under 66%.
It will be interesting to see how a dough made with the combined Detroit and Boardwalk dough pieces behaves from a handling standpoint.
At this point I do not have another possible experiment in mind. So, for now, I would prefer to see how the combined Detroit/Boardwalk offspring dough works out, and what lessons are drawn from that experiment. Also, you already have your hands full enough at the moment attending to your mother and related matters.