Find out if you can adjust the keyboard on the RD-700. Go back to the store, ask to see the manual and see if you can do it.

I have the Roland XV-88, which is similar. The XV-88 allows me to set the keyboard to a ligher/more responsive feel or to a heavier/less responsive feel. There are a total of 5 keyboard settings on the XV-88.

It's nice to change the feel of the keyboard to match the sound you are playing, for example organ, synth or grand piano.