I'm using Openinkpot now on my Hanlin. Font I use is DJVu Seriff. The developers gave me a .deb that disabled bytecode for fonts and this font looks great. Nice contrast. If the display doesn't do it for you, I don't think there is a display that you'll like at the moment. Maybe the next generation will have a whiter base.
For me is more than enough. Anyway, I can understand that you don't like the contrast. The other day I picked up a p-ebook (15 days with the Hanlin and haven't picked a p-book since I got it :-) ) and the paper and font have way more contrast than the E-ink display, but I don't find the E-ink display unbearable. I really like it and I don't miss the p-book contrast much.