Heat your grill on high for at least 10 minutes, then reduce the heat down to medium-high.
In a large bowl, whisk together the tomato paste, honey, vinegar, chipotles + sauce, garlic powder, chili powder, and salt. Transfer 2 tablespoons of the mixture to a small bowl (for the yogurt sauce). Transfer another 3 tablespoons into a small bowl or plate (we will use this to glaze the chicken later).
Add the chicken to the large bowl and mix to coat thoroughly in the marinade.
In the small bowl with the reserved 2 tablespoons marinade, add the yogurt and mix to combine. Set aside.
Add chicken and corn to the grill, making sure to get as much of that marinade on the chicken. Cover and grill for 5-6 minutes or until the chicken has nice grill marks/char, then flip the chicken over (rotate the corn as needed until charred). Use the 3 tablespoons of reserved marinade and brush on top of the chicken. Cover and grill for 4 more minutes.
Transfer the chicken and corn to a cutting board until cool enough to handle. Slice the kernels off of the cob. Slice up the chicken.
In a medium bowl, add the corn, radish, cilantro, lime and salt and mix to combine.
Warm your tortillas, top with lettuce, chicken, salsa, and yogurt sauce.