Not sure what the right answer is and I have not tried customizing after training because I took care of that first, but...
I have 7500 titanium-tipped, mahogany shaft, raven fletchings trained on an Elite Flight of the Fancy.
Completed is an iron-tipped, mahogany shaft, raven fletchings trained on a yew compound bow with a might +3 on it.
So far, the trained bow is functioning properly. Should it be?