Hi Blackiekitty,
I have just looked up the star charts you mentioned: period 8, faicing S1 and S2/S3: Facing S1 has a very good combination at the back of the house, S2/3 has a very good combination at the front of the house.
So I do not quite understand whre you find the great flying star on the front door in the chart S1? You're sure about the charts? In DFS the facing direction is the facing direction of the front door faces (from the inside out). So in a S2 house built in period 8 you'll have an abundance star AND a relationship star at the front door.
From my personal experience I would never ever choose a home where the best water star (in the current period it's water star 8) flies into a bathroom. But if you choose S2, you have the dominant water star in the South, which is your facing direction and that is on of the best things that could happen. Your master bedroom will be located at the back of the house, which will then be the North sector. There's no disaster star in the north, but the future relationship star (mountain star 9). I would at all cost avoid a bedroom in the Northwest where you'll find the most negative star combination that can be found.
But, if you choose S1 and your facing direction is within a 5 degree range to SE3 then you could use a hexagram and change the facing direction to SE3 which will provide an abundance star at the front door and a power & relationship star at the back of the house (which is a very good chart). But you'll have to check with the builder if that's possible at all.
Maybe it's a good idea to use one of your consultation vouchers and check directly with one of the FS experts at Learning strategies. They might have a look at the possible floor plans, too.
Love,
Astrid