Well the IQ Ruby has the reactagloss not the 4kfast.
That pretty much sums up your described ball motion need, something like a renevant or phaze 5 would probably work too.
A track kinetic would be great if you can find a clearance one. Melees always work for this too.
Personally I have IQ Ruby, renevant, wolverine all fitting this lower mid polished pearl spot in the bag.