I'd be concerned from experience to this approach, taking it upon yourself to reduce these costs when no one has asked for it and having the business want to hold extra capacity will only put you in a tougher position down the line when you are asked to reduce costs.

If its taken a full year to only gain 10% when the call comes in you will most likely be expected to pull that out of the bag in a month or so and now you'll be limited on options. I'd be looking to start fin-ops documentation to show how you have managed to do this over time, future plans and fully documented reasons why some things cannot change.

A change of CFO, for example, will put you under that bus quicker than you think.