Speaking from personal experience I've only ever obtained one Angelic Blessing from MDTs (I hunted Triple Rumos on three characters from level 76 - 93 without a single drop, MDTs from 116 - 127 without one until I trained a Merc) so it may be that their drop rate is slightly higher and their spawn is also decent.
On that note...if you're simply interested in getting the recipe I'd recommend putting three characters on the Mining part-time job every six hours (You can go for less too) as the recipe can be obtained as a bonus and people have obtained it regardless of profession level. Oddly enough, my Mercedes was also my first character to obtain the recipe this way.
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