another ? about my 1st 741 build

This is about the whine in my 741 build. I removed the 3rd member and did another paste ring pinion wear pattern keeping tension on the ring gear as suggested. I have a great pattern on the drive side but none on the coast side. I rechecked my backlash, it was a bit tight-.002 to .003. I also rechecked my pinion depth, it was 2.770 as stamped on the pinion with 15" lbs. torque of preload on the old inner bearing which was good. My actual ? is when do i tighten the pinion nut to 120 ft lbs. Just for the sake of knowledge I tightened the pinion nut after checking my pinion depth. It went to 2.775. Is this normal or should I have 2.770 after tightening the pin nut. In all my on line info no one mentions this. Also when I pulled the rear the wear pattern on the new gears suggested according to the diagrams that I should decrease the backlash. Help here is needed!!!