I've only just noticed this thread,so forgive me for coming in so late,firstly what's done is done,you did what everyone here told you to do and what you thought was best for your dogs,so please dont feel guilty :)
BUT dont you think rehomeing one is jumping the gun a little?

Correct me if i'm wrong but they have only had little scraps,which isnt that unusual when you have 2 of the same s*x breed,so i have heard,and i thought you had corrected this by not grooming them together??
Why not get one spayed and carry on as usual? How can anyone possibly predict that this pair will hate eachother in the future and try and kill eachother? On one hand people are saying not to tar all ebt's with the same brush as they are not all aggressive,but on the other they are saying re-home one as this breed especially can be vicious/aggressive,or maybe i'm reading this all wrong

I've had 2 females living with me on manier occasion,the closest in age being 4 months,cant say i ever had a problem! At the moment i have 2 females and a male,all are neutered/spayed as have been all of my previous dogs, as i dont believe in keeping
pets entire,i dont see the point of putting them through the stress of having to ignore their s*xual/natural needs if they are never going to be bred from.Perhaps this is why i have never had any problems with same s*x breeds as they have all been altered???