Reworked Speed Cycle numbers don't really make sense.
Small cycle - up to 3%
Medium - up to 6%
Grand - up to 10%
Doesn't really make sense that you can get two small cycles to equalize a medium and 3 to nearly equalize a perfect grand charm since small speeds are easier to get max roll on and more frequent it seems.
It used to be (before rework/nerf) that inventory spaces became more valuable as the charm increased, so with 3 perfect small charms, I think you could get 18% (used to be 6% max if I recall), yet a grand could go for 25%, making your three spaces more valuable.
If that theory is correct and you wanna uphold it, small cycles should go to 2, medium 5, grand 10. Or rather 3, 8, 20 (though thats a bit too similar to what it was I guess)