Problems and cracks with dough

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Hey there, I hope you're doing great. 

I have a situation with my dough. It's cinnamon rolls. I've been doing cinnamon rolls for a long time. I kneaded the dough by hand but since it was a 8 kilogram batch everyday, I bought a mixer or kneader. I have to say it's really powerful and fast (I can't change the speed or levels). The thing is, that I started kneading in the machine for 2:30 minutes. I thought it was okay, but then started to increase the time of kneading to 3:30 and they came out great. Still, I thought the dough was always very sticky and it seem "shaggy" when taking it out from the kneader. I increased the time to 4:30 minutes and did the windowpane test. Dough was smooth and it seemed it has a good level of gluten formation. 

 

The thing I don't understand is when I roll it out as a rectangle in the counter. When I roll it, it starts breaking, and I can see the table or the counter (at this point the dough is still very soft and well fermented). When I place them in to a pan and let them rise, they start breaking or cracking. And when they are in the oven, they don't rise well and they keep cracking. 

Let's say I make 10 boxes/pans of cinnamon rolls in a day. The first 3-4 are good, they don't break or crack at all. The problem is with the last ones. And if I put the dough in the fridge (even if it was the last dough) for a little bit, and roll the dough in the counter, it doesn't break (this is driving me crazy). 

 

So, I have some theories for this, but I would like to hear your opinions.

1) Letting the dough rise for a long time in room temperature.

2) Using to much yeast (I use 85-90 grams for 5000 grams of flour)

3) Overkneading (?)

 

To what I can recall, I don't remember this happening when I kneaded by hand.

 

 

 

 

My cinnamon roll dough look kinda like this (left dough in the picture) after kneading it and forming it in balls.

 

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Maybe the powerful fast mixer is tearing the gluten when mixing for too long. Maybe try 2 sets of 2 minute mixes with 15 - 20 minutes rest in between to let the gluten relax?

I did something similar to check and feel the dough every 30 seconds, starting when the dough was 2:00 minutes already kneaded. From the 2:00 - 3:30, the dough is still sticky to the point I can't take it off of my hands.  Even at the 4:00 minute mark, when I take the dough off the kneading bowl, a lot of the dough sticks to the bowl. I have to spend some time getting it out.

 

Another point I forgot to tell is that when I do half of the dough (just 4 kilograms), it gets nice and without the problems of cracking when proofing, and I let it knead for 3:30 minutes, so it's strange to me that kneading the double amount of dough with just one more minute, could damage the gluten a lot?

 

of the mixer.

Can you rig a device to reduce the amount of power going into the mixer?  Between the mixer plug and the power source?  (Hoping an electrician gives advice here.)