My current "system" is alternating between repeat business and girl's I've not seen before
that way, 50% of the time I get a girl I know is good, and 50% of the time I get to try something new, and also see if I can find an even better girl to then later see again.
Variety is the spice of life, and you owe no loyalty to these girls. Similarly, I get that you're looking for an authentic GFE if you go back again and again, as you get a nice bit of familiarity / closeness with them, which is good in a way, but don't develop too much EAS and still fuck other girls.