The thought that runs through my head is, when you modify something like that, it becomes your exclusive property. No one else knows what you've done to it and no one else knows the procedure to operate it correctly. Most people can take one look at the things you mention and say, nope, not gonna try to run that thing without Chuck around. But because a modified grill seems simple enough externally that it would never occur to someone that Chuck has souped it up, you then have both a legal and a moral responsibility to make sure that no one is able to operate it without your supervision. It is your exclusive property. If you want to teach your kids how to BBQ or have the wife get the grill started while you are on your way home from work, you wouldn't want them operating a modified grill, any more than you would put a supercharged alcohol-burning engine in the car your wife uses to take the kids to soccer practice.If your grill is really not getting as hot as it used to
Sounds like its working exactly like a brand new 300 series I've used several times did. While I think modifying it is something I would do, I can see the perspective of other people that wouldn't attempt it or recommend it. It has as much to do with confidence in your abilities as it does with anything. I used to modify cars with superchargers and all forms of equipment. As a teen, I hot rodded my minibike to have a ported, milled head, and alcohol burning beast. I've done some type of modification to my grills just to do what I want. But, stock is ok if you're happy.