Ok I have a plan
Release the music video on Tuesday and do no promo.
Watch as the single climbs or falls or climbs and then falls and so on.
We supported you PI, now it's your turn to fight on your own !! If the song shows potential for top 10, then promote it, perform it somewhere etc.
if not - even better, release the next single in October (a week before the album release) or even 2 weeks depends on how bad PI is doing.
So yeah. The worst thing would be Gaga performing PI for it to still flop. At least she can use the promo for another song.