Digital BW, The Print

So with all of the good info presented by Paul and others, I made my 
first grayscale ICC today.  I printed Paul's 21 step stepwedge (with 
2.20 max density, as that's what I get with my R2400 and EPSM).  I 
noticed that the profile embedded with the file is grayscale 2.2.  I 
have been using Dot Gain 20%, as I've heard that it leads to more 'open' 
lower print values.  I didn't color manage the stepwedge. (That was the 
right thing to do, right?) Should I change my working space to 2.2 when 
I use the ICC?

BTW I used my MacBeth 914 reflection densitometer and coverted the 
visual density to L* via a formula.