The size of the flower is in range for Phal ALS, a bit smaller than awarded forms as you might expect. Plant size is about right too. There aren't many parishii hybrids, which it definitely appears to be, so ALS seems the best possibility.

My concern about the quality for breeding was that you seem to saying the flowers are not well displayed. I don't care about award quality flowers, but you can go through all the effort and time just for your own curiosity and satisfaction, or you can just as easily create something others will truly enjoy as well.