Hi swami,
the topper you were using would slow down the break in period of the mattress because it will absorb much of the compression forces that come from sleeping on it and “shield” the layers below it to some degree. It may also affect your own adjustment period because you would be adjusting to a different sleeping surface than just your mattress and then if you remove the topper you may need to adjust to a new surface once again.
You may also consider carefully crawling or walking on the mattress evenly on the surface to help with any breaking in period.
If you do decide to add a thin topper (which can be a good idea if you are comfortable with the side to side height difference) … post #2 here and the post it links to has some topper guidelines including a link to some of the better topper or component sources I’m aware of.
Phoenix