A couple mechanics questions (BRDs/general.)

[LionKing]

Oh right...My memory has failed me..

[Felessan]

Excuse me, but I don't think there is a necessary to pop all the CD before applying Dots because besides Internal Release and BfB, the rest are not affect the DoTs potency in anyway, right?

4 of bards cooldowns affect damage (RS, IR, BfB, HE) and fifth (Barrage) you want to stuck as close as possible to other four as it have short duration (10s), but boost your autoattack 3 times. And you want all other buff affect autoattack as well to further boost damage.

I use quelling strikes before engage, and Barrage between the 2 DoTs usually to benefit from the CDs.
SS > BL > RS > Hawk's Eye > B4B > IR > VB > Barr > WB > Flaming arrow

Better move BL after you applied at least some of buffs, 50% more damage and 10% more crit is a good tradeoff for 4 sec of cooldown as you don't even have a chance for BL reset yet.

[SeraviEdalborez]

Piercing as all other damage from bard.

Half-correct; the initial potency is piering (as with anything done by a BRD. The DoT element has no extra physical subset and is not boosted by Disembowel.