Yes my DD has always preferred the morning nap as well, and we are well into the 2-1 and I did eventually habe to do the short AM, otherwise she would happily nap 2hrs in the morning, but then that would be it and she'd be awake from 11:30am until BT 😳, she would refuse all PM naps no matter what. She is 13 months though, and we just moved to that recently.
It might be worth trying just to see, often the PM nap is hit or miss because the morning nap has been so good, so if you eliminate/shorten the good morning nap the PM nap improves. Either way I think your options are to keep pushing the good morning nap later and adding an afternoon CN, or try for the shorter morning nap.