Maybe you adjusted the rear too hard. This sort of thing is usually down to suspension setup along with tyre's.
I used to get the bike feeling skitty when I first got it. I had to lower the front and soften it, then firm up the back a little (make sure you still have approx 30mm of sag though, no sag will also cause issues!!!!). Dont know if this will work with your situation but it would be a good place to start. If too much weight is transfered to the back it will make the front too light and obviously it will get funky.
Glad you are reletivly ok there!
