I actually had a couple VERY good FMQers tell me that they unplugged their regulators because it inhibited them, and at times couldn't keep up. I was told that with no regulator, and LOTS of practice, in the long run you'll be happier. I now agree. I'm a novice, but just in the 2 months I've been really practicing I've seen drastic improvements.
Google some Sharon Schamber, Harriet Hargrave and Leah DAy stuff/quilts, and you'll see just what IS attainable without a regulator. :)