Although still learing to fly, have sat in the left hand seat in a few commercial aircraft (737,767,777)at the gate, no trouble there at 6'5" tall.
From what I have heard the only trouble you will have is getting BA sponsorship, but if you have CPL already, guess it doesn't concern you!
I'm sure a commercial pilot will be able to give you a more relevant answer.
Cheers,
tom.