Congratulation on your new discus project Paul .
From your plan I think that youve done your homework and you sound pretty prepared for succesfull discus raising .
Why waiting another year to get your discus ?
I didn't understand so you plan to mix different sources /breeders for discus , or you plan to get them all at once from one breeder?
Try not to mix different sources.
Francesco Pennazi is a sound name in discus bussines and he has some stunning Heckel crosses , along with many other strains and great looking discus.
As for filters, if you do plan to run 2 jebao for the long run , you might just run them both right from the start . Too much filtration cant hurt , just be carefull with restricting too much water flow .
About aging. I think 12 hours will be enough if you manage to aggitate water more , for example with a strong filter pump instead of just an airstone .Better agitation =faster outgassing and PH stabilizing.
This wood with white deposits looks like it was sprayed with pesticides.Be careful of that.
I like your "colour theme " idea . Just be sure to get discus from a single source instead of mixing them .
Good luck Paul .