As a fashion shooter, I nearly always use a "micro-pop" of strobe fill on my backlit shots. The more lifestyle shot, I just open my exposure, but some of my clients want me to hold more of the background,s I'll often pull out my strobes since so many models have problems with reflectors.
I always meter the shadow, under the chin then open up 1/2 to 1 stop, depending upon the garments and background. For my strobe, it depends on whether I use my Elinchrom ELB400 or the PhottixIndra I currently own or even a simple speedlight. I usually use the first two with 27" or 38" octo box or even a beauty dish. My purpose is usually to mimick a natural fill rather than over power the sun. Essentially it's a beauty shot. So, metering with current meters is tough if you are using HS or HSS strobe. (I ordered the new Sekonic L-858 which supposedly will meter these strobes.) Anyway, if metering at your max normal, you only want a lower power fill. It shouldn't affect your ambient more than a tenth or two. I like my exposures on the light side - clean. Another poster mentioned tethering. Personally, I hate tethering on location. It's cumbersome. I never tether on location because it limits me, though I will in the studio. You need a good assistant -- really multiple -- if you tether on location. I always have 3 on a shoot. 2 on site, and one acting as tech in the RV. The key is really becoming adept at using your hand-held meter and reading the histogram on the back of the camera and buy a loupe from Hoodman and so you can see the LCD to check yourself. You can look at my Instagram page to some bts shots from a recent shoot @nemoniemannphotography