The X5D is a "budget" synth. I have one as well in addion to a couple others from Roland and Yamaha. You can't expect great keyboard action out of a $500 synth that is as light as a feather and constructed as cheaply as the X5D is.
If you are looking for better response, I suggest you look at a used higher end synth or a MIDI controller. The X5D does not transmitt aftertouch data either. Considering you are driving a XV3080, it would be to your benefit to have that capability. It will allow you to be that much more expressive and give you more control over the sounds produced by the 3080.
[This message has been edited by brzilian76 (edited 02-04-2002).]