Yes it's a continual learning process, even the most experienced, most geekist professional can have a bad day and make mistakes.
It's always best to have an open mind (and a sense of humour) on these forums and try not to take things so dang literally or personal.
IMO in regards to maximizing often it's the source materials (tracks) and style of music that also needs to be questioned.
Often the fix is in the instrumental arrangements, tracks (source material) I suppose it's like putting the horse before the cart.
Often I need to go back and clean up something, cut (filter) or completely remove a track. The style of music I do borders on complexity, layered, intricate, but I'm a sucker for challengers. Maybe next time I'll keep it more simple and take the less is best approach.
As for how much to maximize? I think that's a personal preference and in the hands of the experienced user I'm sure they'll do fine, just as long as you don't blow a fuse and blackout the entire neighborhood. How much hardware have you got wired up?... 500+, {ahem} do you have a fire extinguisher?
Now that I've got the free radicals happily bouncing around from that point on I guess -3 is a good starting point, kinda like a point of reference for me and I suppose -3 must be my lucky number?.. I dunno?.. a little more, a little less (as it also depends on what hardware/software is in use and on what sort of material and for what purpose).... whatever gets you rocking, jazzed, pinked or la' ga' ga'