Yeah, something does sound way off. I know that your truck is a Z71 and all, but still, with your mods you should be seeing low 15's at least I would think. And I'm sure your truck weighs more than you think. My half ton crew cab weighed in at 5155 with me, half tank of gas and street trim minus the tailgate. And this is a 2WD. My buddies Z71 in street trim was like 5185 with him in it.

 

And my CC 2wd Weighs 5370 LBS with me, my wife, my baby girl, and 3/4's of a tank of fuel. So, with just me and fuel you can say 5220 (wife 120, baby 15 , car seat another 10-15). And in case you are wondering about the weight of fuel, it is 6 lbs for every gallon.

 

Took a quick ride after work, looks like I have about 27-28* timing at WOT, except 1st gear, which seems to have 25-26*. It's kinda tough to go WOT around here...every time I open it up, I end up just about to drive over someone before it even gets a chance to shift lol!

 

just sell me your cam and get a bigger one:-P