Welcome to the real world. Your fill up problems sound normal to me.
Most gas pumps have such a strong pressure that the feedback (which
triggers the automatic shutoff) happens the moment there is any
splashing going on in the fill tube.

A fill up on my Syncros is a time of patience, where I trickle the fuel
in at the slowest rate the pump will allow. I can usually get at least
1 gallon, and sometimes more into the tank after the first automatic
cutoff.

it also helps to pay attention to the orientation of the ground at the
pump. I like to have my Syncro leaning away from the pump and pointed a
little downhill. Makes the fill up go a bit faster (and closer to full
when the automatic cutoff kicks in.)

More recently it seems that several stations automatic cutoff is even
more sensitive than before (making fill ups all that more of a chore.)
Except for that one station that didn't seem to have any automatic
cutoff....