Are you going to cover? I would raise it back up to shock level with bleach and then winterize the pipes, cover, etc.
Next year, shock the pool until the FC holds overnight, then the next day add polyquat 60. Adding it within one hour of shocking caused the PQ to consume some of the chlorine and interfere with the FC tests, it seems like you had an overnight drop of 1.5. (I'm sure all is fine, I'm just suggesting to err on the side of pre-caution/prevention.) The PQ consumes the chlorine. So for added insurance since you did them so close together, shock again and then cover.
By shocking before you winterize, you are ensuring that anything organic in the pool is dead, thus make sure it's holding overnight. Then once it does (the next day, perhaps) you add the PQ for added insurance. The PQ will cause the FC to drop. Since you added them so close together, it is slightly concerning the combination won't be as effective, KWIM? I hope that makes sense....