Carb issues

Yeah I was going to put a filter on but with the factory type hard lines for the six pack so I have to figure out where to put it.As far as the needle and seat goes I have tested them and they seem to be working and if trash got in one it would pour gas out of the top of the carb while running.I've had them to stick before and they will cover the intake in a minute.fanofpetty only the center carb has a power valve and all the carbs are doing the same thing.It was new when installed a month ago but it could have blown and in theory the center could have a bad valve while the outter carbs have a different issue.Oh and i have rebuilt and cleaned each carb twice using carb cleaner and compressed air,all the passages appear clean.Any ideas are welcome and appreciated.