I just tried 2 H9s on a USB hub.  No dice.  H9 control crashes.  I suppose I may try another hub.  This is definately a bummer if you can't import presets to IPad (and I still can't after many efforts), BT does not work on PC and USB hubs are problematic.  Makes it very hard to justify buying the 2nd H9 I just got.  For now, I've got it occupying 2 USB ports on the PC.  It works like this but I only have 3 ports and I have other  midi/ audio devices that really need their own USB port.  The USB BT thing is a great idea but does not appear to be workable.  

Those are a lot of problems you just mentioned at once.  If you want to send an email to support@eventide.com or start a new forum thread, I can try to help you out with some of those issues.  I'd rather not have this discussion on the 'Share Your Presets Here!' thread though.