For any guitar dedicated to DADGAD, I use True Mediums (Medium 1st, 2nd, and 6th, and Light 3rd, 4th, and 5th) on my Lowden and Martins. On my McNally OM, I stick with Lights (12-53 or 54). All work fine for DADGAD.

For the record, I never use anything heavier than Mediums (12-56) on my guitars. I have never used Heavy (14-59) strings on any of my guitars, nor have I ever recommended then to anyone, anywhere, at any time. In fact I wouldn’t have the faintest clue where they might be available.