Like I said, I have the front lowered 20mm along with the rear raised about 50mm. No problems with stability. I've run it hard on the track after. There are two turn exits on that track that can give major tank slappers - if I hadn't had a steering damper on my GSX-R600 it would have done some good ones... My SV doesn't have a damper and still it only flattered once, then straightened outBe careful if you drop the bike down the fork tubes. It's going to change the steering response and it can catch you off guard the first time you go out. Be gentle with your steering inputs until you are used to it.
Engineers carefully make the front and rear height, so most people lower front and rear evenly. Lowering the front can increase steering response, but there's always a price.