So I think thI'd was answered earlier, but I wanna clarify. Use Life Surge on Chaos Thrust after certain points in the rotation at low skill speed? Here's how it normally goes for me:

HT->B4B->ID->IR->Dis->Leg->PS->CT->Jump->Phleb->DfD->TT->SSD->VT->LS-FT
Then repeat the combo through all 3 sets. The next time B4B and LS are up is on the 5th set (heavy thrust falling off I consider it ending a set) starting with TT combo. After this LS comes up more frequently than B4B does, so using it on CT will be a DPS increase and re-align B4B+LS? I've still been holding it at 341 SS, and it feels like a loss at that point. But I'm wondering if using it on CT is better or using it on unbuffed FT is better? Just curious as to what others have found out. Rotation is different at this lower skill speed haha.