You're right. I didn't even think there is no reason to wait on all your cooldowns. Start the fight with huge burst. You want to do PB after the first DK. It will already have leaden fist from previous combo so there is no reason to include it in PB. It will also end PB on a DK giving an extra Leaden. Depending on animation and latency, it might also be ideal to do SSS before TK/Buffs.