Bladestorm cost 4 focus in watchman spec, slash costs 3 (-1 refunded for trait) so consider using that instead. But this is a minor change realy, your rotations sounds fine. There is no major survivability difference between Combat and Watchman at lvl 20. Just remember to keep stacking that power and strength, if you get orange items while leveling you can then take the zone commendations as quest rewards and turn them in for upgraded mods, armouring, hilts etc on the orange items. On level hilts for your lightsabres make such a big difference. If you have any other questions feel free to pm me