Work interrupted me, but I finally found time to add the 10" Slingerland tom to my existing set. The tone range is great, I can play "I Don't Care Anymore" by Phil Collins again!
The 10" tom is a lot taller than the 12", so I just put it to the left. I didn't try to shift the 12" and 13" to the right. The set looks a little lopsided now :).