Set the chunk size to three for best effect. Just gradually increase it each time, and also try using it occasionally with the speed far too fast. You'll get used to subvocalizing less, and reading multiple words at once.
Of course, for complex texts like the ones you read, it's natural to read much slower. I read 600 WPM for most internet articles, but I'm sure I wouldn't read plato that fast, nor as continuously.
That technique is called Rapid Serial Visual Presentation: http://en.wikipedia.org/wiki/Rapid_Serial_Visual_Presentatio...
(The Wikipedia article should mention saccades (http://en.wikipedia.org/wiki/Saccade) but strangely it doesn't.)
I wrote an RSVP reader in the mid-to-late 90s in QuickBasic. I'll have to see if I can dig up that code. :)
I am still annoyed that things like the Kindle don't have that mode.
Has anyone made a syllabic RSVP reader before? Might be interesting to see how much more natural it would be (my hunch is "a lot").