I must admit i ran mongoose for quite some time and noticed a ton of uptime, and in the last month (essential ICC25 Progression) have been running blade ward but with high Parry (approx 22%) i hardly ever see 2 stacks and only seen 3 a handful of times. I never looked at Blood Draining as an option, but anything Lore says usually has to be given some serious food for thought. And i can personally attest to the 95% - 15% Health swings and when i run 49 - 54k Buffed in 25mans (depending on trinket choice) that is sick!! so the BD Tick really could be worth it, and will have to be given a try. But i think Mongoose is the better choice over BW as its just not up enough where as Mongoose was nearly always up.