In a medium bowl, mix together the sour cream, heavy cream and salt. Cover with plastic wrap and set out at room temperature for 3 hours.
In a large stockpot filled with water, soak the ears of corn for 20 minutes. Remove the ears from the water, shake and tightly squeeze the husks against the kernels of corn to get rid of any excess water.
In a food processor, combine 1/2 cup of the prepared cream mixture with the chipotle chiles and puree until smooth. Reserve the rest of the cream mixture for another use. Set aside.
Turn a grill to high and close the lid. After 15 minutes, lower the heat to medium-high. Place the corn on the grill rack and grill for 5 minutes. Turn the corn over and grill for another 5 minutes. Remove the corn from the grill and set aside to rest for 5 more minutes. In the meantime, keep your grill on with the lid closed.
Take the grilled ears of corn and pull back the husks, exposing the kernels but keeping the husks attached at the bottom. Increase the grill temperature to high and place a sheet of aluminum foil on one side of the grill. Place the pulled-back husks over the foil, allowing the exposed kernels to sit on the grill grates. (This is done so the husks don't burn before the corn can char.) Close the grill lid and allow the kernels to char so become dark and golden brown, about 5 minutes. Then turn the corn and char the other side. Remove the corn from the grill. Serve immediately alongside the chipotle crema, crumbled cheese and lime.