My impression with these guys are "More skulls, less blood tears.".
Getting perilously close to the "Blood for the blood Emperor!!!!".
I do seem to detect a markedly reduced amount of blood drops on their armor.
Maybe not to give them any ideas?
I believe the explanation for so much craftsmanship by the Blood Angles is for the troops to "zen" to keep the red or black rage at bay.
Flesh Tearers are down to only a few companies so they can "relax" by doing more work to make up for it.
I hope these pictures help a bit.