This is similar to how we did it too...
PWB was used for the bolt. We did not use lust for the tentacle, but we used it during cata and to help make sure blisters died asap. We used the same 7dps setup, so the small tents in Ph2 died with little issue. The adds died asap while the tank rolled his cds as needed. We managed 2 add phases, and got the kill just as the 3rd set of tents spawned. Have your dps hold their 5 min cds (works well if lust is used when we did) once the 2nd set of adds are dead. If needed they can use them to ease the burden of single tanking the 2nd set of adds, as they can hit rather hard.