General sentiment I was getting from others while were were playing was that there are too many paths and the high path isn't really worth taking since it's slower. Probably fine for really crowded servers, but there aren't as many players these days, so it might be better to streamline things a bit (or just tweak some minor things and start a new layout, like it sounds like you're doing).
Oh, other comment was that there's too much of the same texture. Maybe use the concrete for the ground and the grey rock texture for the walls?
Also, the ice ramp launches you straight into a beam that kills your momentum.
The little board ramp up to the flag is kind of awkward -- I'd just make that whole opening have a ramp or some stairs.
Finally, improving the r_speeds would be good. Learning how to use hint brushes is pretty valuable, too, so you might want to take a look at the sites linked here:
https://forums.digitalpaint.org/index.php?topic=25467.msg228779#msg228779