Yeah my method is simply as stated, Cronley run with some Fabius kills. Ca. 100 dynamites you go trove, which will give you like 93 legendary craft mats.
93/8=11.625
One run with 100 takes about 2 min, so 11.5 legendaries per 200 min, plus the random legendary from trove and chests, and heroes.
Going bloodbriar and stuff on the way to Tyrants is too much hassle, just disenchant the crappy leggys you get for a chance at a heart, tainted or blood.