Our bodys are pretty awesome but they also can do some tricky stuff my opinion this is more of a mental thing than anything else. You said the mirror and lifting next to the hot chick and that kinda backs up what I think. The only real way to know is dont change anything and try it the next...
I added lats in rotation a few cycles back and haven't hit a nerve or vein yet. They will take a lot of oil. It was a little akward at first but just like anything practice makes it easier.
Im on a couple other forums but Ive been creeping in the background on this site for awhile gathering great info from some of you peeps. Im not sure why I decided today was the day to join but I did and here I am. Ive been lifting seriously for about 6yrs now currently sitting about 265b 6ft'3...