Disklavier

Hi all,
I have a DC7A with the original controller.  Works great.  When I use the Yamaha MD-BT01 bluetooth adapter with my Ipad and Sweet Midi Player,  most of the time it works very well.  Trouble is it also quite often has (what I think is) latency.  The song will be playing and there will be a slight but noticeable "skip of the beat".  It's very intermittent and I can't find anything that makes it better or worse.  It will happen with the Ipad 3 feet away or 20 feet away.  It happens with 2 different Ipads.  It's very annoying.  Any suggestions would be great.
Next,  I'm an Apple guy.  Everything here is Apple.  I really like SMP but the version for the desktop doesn't have a random play function and I don't like hearing stuff over and over in the same order.  Does anyone know a good app/program that will allow me to play my Midi's from a Mac through a USB/Midi adapter?  Something like SMP that has playlists but also has a random play feature?  I do have a VERY old Windows XP computer that I used for working with the 3.5 floppies and it has VanBascos player on it.  That does what I want but I don't want to have the massive box, additional keyboard, etc. around just to do that.  Again,  any help would sure be great.
Thanks for looking at this.
Joe