'13 SHO... tuned.... WOT shift is solid 6000 rpm 1-2 and 2-3 in Drive (not sport or paddles). Haven't pushed it in other shifts as I'm usually 65-75 mph at the 2-3 shift.
I'm still shifting at stock redline, but the 1-2 wot is brutal. I've gone through a half tank and it hasn't gotten better. All other up shifting and downshifting is fantastic.....
Do you have data-loging? Does it show that? I've been consistently unhappy with the top end of this truck. If I'm missing 700 RPMS on a boosted car (Well any car, really), that could make ALL the difference. Especially that shift from 2nd to 3rd, the gearing is so much longer that it boggs down into the Low 4000's when it shifts at WOT from 2nd to 3rd.
