If she's charging $170 in theory that's supposed to be the rate for body slide with no extras.
For most girls $270 is supposed to be the spa mandated max for 40 minutes, so for full service you'd be paying an extra $100, just like before, when $100 was the unofficial Premier price of an upgrade to FS.
And for the bump up to a BJ you would be paying $40 extra in theory, if her starting rate was $170.
In sum, for 40 minutes $170 is no extras, $210 is BJ included and $270 is BJ and FS included.
The point of the system is to prevent girls from making up their own fees and providing clients with pricing consistency.