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You are reading my mind, right? :D

I had it this way. Respectively, cables from PSU to 5A clamp on RAMPS, then from this 5A clamp to 11A clamp and from 11A clamp to fans. It was working great, but it is not good solution for PCB heatbed. With all fans (I have 4 mounted on the machine) connected to 5V USB charger I was able to get 106-110°C, but when they were connected to 12V from PSU, it was barely 90°C. Although my fans are only 7 CFM, they are moving air way too much around heatbed.

Did it this weekend, because I wanted to get rid of the USB charger. Now I am going to do some measurements, if all of them can be actually connected to 5V for endstops on RAMPS or what resistors are needed to reduce voltage from 12V.