I think this seems to be my biggest problem. Does anyone have any orchestration tips or rules on how to avoid heaviness? My softer sparse passages sound fine, so I'm mostly talking about loud tuttis. It seems like by the time I've thrown in all the parts, I have a muddy, nondescript mess.
Next time I'm just gonna try some of the obvious things (wider spacing, more doubling, more rests?), but I thought I'd ask to see if anyone had any clever tips or a similar problem.