Roasted comp chicken: rule 45?

Looking for input on chicken cooking on a UDS. I saw this thing called rule 45=4.5 lb chicken 450 for 45 min. My last attempt at comp chicken practice was pretty decent. I'm practicing alot at chicken Because it's my worst category.
Cooked @350 and it was an improvement on my normal 300 cooks

Got a diffuser plate for my UDS now so I think I can push the higher temps. I turn in chicken halves for IBCA and CTBA.
Use 1 chunk of pecan, 3 chunks of cherry, and some
Lit briquettes and let the fire go for 1 hr to clean up before putting the meat on

There is a team in my area called orange maple cookers and they kick everyone's arse with just lump charcoal on a old smokey.

I just bought the IQUE wicked good BBQ book and have heard good things about the spatchcocked chicken. Any comp advise is helpful.

Surely some of you had to of put your chicken on late and had to cook high temp. I just heard Howard Muniz of orange maple cookers just snapped off 1st place chicken in Pasadena tx with over 100 teams. I have cooked against him before in a pretty tough crowd, and got 11th, he obviously got 1st. I would love to know what the heck he does to make his chicken so farkin good!