I just have the standard grates and fire grate so I can't address those questions, one thing I did learn from thirdeye is that I had my fire grate in upside down. I've since flipped it over but I honestly don't notice a big difference.
Here's how it's supposed to go.
"I can get a good look at a T-bone by sticking my head up a bull's a$$, but I'd rather take a butcher's word for it". - Tommy Callahan III
XL Big Green Egg, 22.5 Weber OTS, WSJ Gold/Mini WSM, 18" & 22" WSM, UDS "No.8"
Flyers Orange Thermapen
Napkin Killers BBQ