Lot of the "farm" dungeons (like brayflox hm) are usually speed runned even in df, and this is what I do pretty consistently:

stoneskin tank before pull: Divine seal --> cure 2 till he is at least 80% hp --> regen --> shroud --> continue to apply cure or cure 2 depending on the damage, if no significant damage is taken then holy spam a few times to stun and deal damage --> apply regen again when it runs out and tank is at least 80%

if there is aoe damage I tend to use medica 1 or cure 3 if the players are in a good position for that one, not usually medica 2 because the 200 potency is really low, and the tank can actually fall to really low health sometimes when the regen doesnt kick in right away, and the 30 sec regen usually ends up overhealing the dps which is not ideal, if you however know that there is much aoe damage in the fight it is really good to throw one medica 2 there so you don't have to heal the dps that much and it also helps the tank combined with the regen.

Apply PoM there if the tank is taking really heavy damage, sometimes the tanks are not really geared that well and they tend to take so heavy damage you can only spam cure 2 and maybe use bene if the situation needs it, but remember that the aoe stun from the holy is really good if you can get it off without risking the life of the tank, a 4 second moment with no damage usually.