It’s easy to confuse planning and execution and that can be a problem if you are considering alternative approaches like lean manufacturing and Theory of Constraints to improve your manufacturing performance.
Dropping inventory below the optimum amount causes shortages, whereas holding more inventory than necessary will result in waste. The main reason for keeping inventory is to save time, so lowering it will adversely affect the condition that the inventory is there to manage. You should go back to why you made those decisions in the first place.
Lead time is arguably the most important factor in manufacturing and distribution. To a great extent, it determines how you set up your business, what inventory you carry and where/why, what you can offer to your customers, and how agile and responsive you can be to changing conditions and changing demand.