Nope, I'm not the designer so me fiddling is a bad idea. Also, I'm not building something that hasn't already gone through a lot of tweaking or isn't at least something that someone I trust has gone through before. It's a one-off but has well formed roots. I also happen to be one of those people who can't stand endless tweaking, cap/resistor rolling, etc. I'm of the opinion that doing so is just a waste of time and yields differences best quantified by "I can't remember what it sounded like before so it must be better".