The Department may by rule modify or make adjustments to any methodology, assessment amount, assessment tier, or other similar provision specified in this Article, including broadening the tax base in subsection (a) of Section 5H-3, to the extent necessary to meet the requirements of federal law or regulations, obtain federal approval, or to ensure federal financial participation is available. However, upward adjustments to Tier 3 rates shall be the minimum necessary to meet federal statistical tests to receive federal financial participation. The Department shall adopt rules to implement this Article under the Illinois Administrative Procedure Act.