*LB gets pushed to 0.954s cast, with EM + HoI + Bloodlust up. Small interval only, not sure how badly does pushing below GCD affect my overall DPS
With regards to which Trinkets to use, use the simulator. As for the Heart proc order, I would set-it up for after Synapse Springs with the start of EM, as the 20% damage multiplier will benefit from the extra Intel of the Synapse Springs with the 5-stacked +power of Heart.
As for the haste pushing LB to .954, it's not necessarily a DPS loss, but rather an over-allocation of points. Having a .954 second cast versus a 1 second cast doesn't have much of an impact, as the only thing still affected at that point is the FS dot. You could potentially reforge some of your non-CD based haste into Mastery in order to match LB with the 1 second cast if desired, but unless your LvB is at a 1 second cast without stacked haste cds, it's probably not top priority.