Just read through your build, Nice! I have been inspired!
I have a similar setup; 3RZ, 5speed, mine has dealer installed 4.56's. But I have been wondering how much power I would loose stepping up to 285's. I want to, but not if it affects the drive-ability of my truck, it sees some longer highway trips and is my DD. Seems like, from what yo have done, it would be no problem.

Sold. New taco time.