Patches and discussion for Ensoniq VFX family

I tried Koto Dreams this morning.  The upper right of the keyboard, when I press down harder (and I mean 'harder'), there is indeed a pitch bend up of the main reed sound.  But there is less of this on the left side of the keyboard.  I have to really push down hard.  The whole keybed moves, creaks.  Needless to say, it's not a very inspiring way to play.  

One of the main reasons I got this keyboard was for the polypressure.  I'm thinking again that one of the previous owners took the synth apart.  

Let me ask you guys this, for comparison.  Does your VFX-SD's keyboard respond sensitively and deftly to your playing?  Or is it more like a clackity-clack feel?  I realize that my Fusion 6HD's keybed is semi-weighted, and from a decade later, and therefore smoother and more transparent to music-making, but how do you personally feel about the response and intuitiveness of your VFX non-weighted keybed?  Maybe I just got a bad deal off E-bay...  Should I look for a replacement VFX?  Thanks.