You have two changes at once here. You cannot attribute anything until one of them moves.

Reference ranges differ between labs, so comparing two reports is close to meaningless.

Loose evidence and no evidence are different, and people overcorrect in both directions.

Most of the popular protocol is borrowed from a clinical population and applied to healthy people without comment. Currently on vitamin D3 myself.

Half of what people describe as tolerance is a change in the underlying condition, and the two need different answers.