First MAJOR MAJOR point. You have zero Expertise.
As a Blood Knight almost all of your threat will come from melee strikes, and with the exception of RS, each of those strikes has a major benefit from Expertise (double the value of hit rating). With 0 exp, you will be dodge+parried on about 20% or 1 in 5 of your swings. This is a HUGE loss of threat. If you have the ability to do so, I'd recommend running EoE25 for the expertise trinket (swap it in for the armor trinket). If you can get that it'll be a quick fix in the right direction. Your goal is at least 26 expertise so you can remove the chance to be dodged (that's 213 exp rating).
The other major feature I'd suggest is that you play better to your talents in terms of the moves you use. DS is a good health restorer and does strong threat when it does heal, but using DRM will make for a much better net value. You have Sudden Doom which buffs HS threat specifically, and using DRM means you can essentially trade one DS per rune set to two heart strikes which is strong on one target but massive on two targets.