I shoot 10 GPP with a 6 strands SBD string and that set-up is fantastic. I use SBD 6 strands strings for a hybrid longbow and a very fast 3-pce recurve. Super fast, quiet, no stretch and they last long! I am using those 6 strands strings for three years now for my lighter bows and I am totally happy with them.
Keep in mind that 6 strands are only good for lower poundages till 53 lbs. Above that you'll have to use an 8 strand. If you shoot as low as under the 9 GPP, I would move over to an 8 strand.
And make sure you give the right lenght to Pierre.