My question is: do any of you use more than one razor for a single shave?
For example, yesterday I used my Rockwell T2 to shave, but used my Henson mild to shave above my upper lip. Using this method I was able to get a BBS on my entire face.
No. More than one razor seems silly and cumbersome. A good adjustable should fit the bill if needed. That said, I use the Rockwell 6S and select the plate needed for the current beard growth. After few months I got good enough that I now never bother swapping plates. If I use an agreesive plate like 5, I only really need one pass with some touch up around the chin.
Regarding the upper lip. It can get tricky just under the nose. So my trick is to ride the cap for touchup in that area and it instantly cleaned up.