modified EA trem rate issue

[m-theory]

I built this layout
http://www.aronnelson.com/gallery/main.php/v/DRAGONFLY-LAYOUTS_0/album19/album145/EA_TREMOLO_VERO.gif.html

Everything works perfectly, and it's an awesome sounding trem, BUT, the rate doesn't do much of anything until it reaches the very end of the pot reach, and then all of the change is bunched up, much as on a mosfet boost, if you use a B5k instead of Ck5 pot.  Is this another instance where a reverse pot is required, or what else might be going on to cause this?  I assume it's not normal, right?