I think everyone's had this problem at one point
One thing I would make sure of ist hat the hi hat isn't closer to you then the tom, that makes it hard to reach, although if youe comfortable like George having your hi hats quite far away then this makes 8" tom access alot easier.
I've got 10,12,13,14 for my racked toms, going to try and fit an 8 at the top, that's going to be hard to play
