Well, I notice you are not getting a lot of responses.
Try re-posting in the "string" section- where the string-obsessed players live.
Give them as much information as you can- racket, tensions, what you are striving for, level at which the girl plays, style of play. You should get some helpful replies.
Personally, I use a similar set-up. Different string brands, but the same idea, and it allows me to hit harder with more control.
Also, if you are going to be experimenting with strings, or forsee years of playing in her future- I would suggest investing in an inexpensive stringing machine.