Sequencer. Set Relative Location/Rotation

Hello, my last question, for a while, finishing this project and hopefully I will be able post answers in return.

Built boat’s rigging in blueprint using Physics Constraints.
BluePrint Root is scene
>then SM_boat,
>>then all the rigging is parented to boat.

On “BeginPlay” SM_boat Relative Location/Rotation is driven by a Timeline to generate rocking from waves.
Everything works fine on play. But once I try to replay what sequencer recorded all the rigging jumps by the distance the BP is away from world origin.

Please help. Spent two days making the rigging work right, and wasted a day trying to record this scene with Sequencer and Matinee. Can’t give up now.
If not with sequencer how would one record this?