but if we drop to 1% towards the end won't the volume also drop and that's what we are doing this for?
No, not what I meant. Start at 10% and then each week for let's say 4 weeks drop it 1%. So...
Week 1 - 10%
Week 2 - 9%
Week 3 - 8%
etc...
Would get volume and not run things too crazy.