The problem with taking the fugue slower is that the countersubject in quaver and quarternotes will feel waaay too slow. And I've been thinking a lot about it, that maybe the countersubject is actually more "important" or "interresting" than the fugue subject itself? Just ask yourself what you think the audience will be humming after the concert on their way home... probably not the fugue subject. The fugue subject is more like a "harmonic background" for the whole piece, at least it sounds better that way on a modern grand piano. Well, you probably get my point... Would be nice to hear your opinion on this.
btw, there's a great recording by Koji Attwood on
www.whitekeys.org, great tempo choices and dynamics, and I think he played the fugue subject with less accentuation, more like the "harmonic background" of the piece, as I said. It sounds gorgeous.
I pretty much agree about the "fugato" section, again, I just tried to do what the teacher told me but I didn't like his choice of dynamics - his version was just loud the whole way, pretty much like I play it now. Sounds a bit monotone to me...btw, I use pedal mostly to hold notes and tie notes which would've been impossible otherwise. I don't use it for colour.