To make the APR fluctuate based on TVL means significant analysis and more code changes. Not going to happen for HF25.
I'd go with this simple implementation right now. Maybe not set the APR at the higher end of the interval (12-15% could be more reasonable for an initial attempt while still being enticing).
Being a witness parameter makes it controllable without code changes.
After the dynamics of the new changes will be analyzed, tweaks and refinements can be implemented.
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