Many times an agreed LT session becomes ST, this is the practice for many greedy girls, who wanted to get more customer for their returns. But Supergirl and Superbaby are well known for doing this kind of tricks, they target on Japanese that give good tips.
Now is low season until near November, which means you have the bargaining power, especially if you come on weekdays.
Never tell them you are on short holidays, as they will not want to waste time to build a relationship, give this a try, I bet you will enjoy your stay better.
I once fell into trap in a agogo like you, for taking her friends, went to disco, and end up good times became bad, LT became short, well this is my experience too, so now I only take one girl.
If you like duo, try devil den for 2 girls if that is your taste, they are professionals.
Bar beers on walking street are asking for the sky, and you don't even sure what kind of quality it is? So most of the time, I will go straight to agogo, what you get is exactly what you see!