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changing from 6,6,150,150 to 100,100,150,150 will change the number of Publishers/Subscribers from 6 to 100 and do not change the buffer size (150). try to change:

typedef NodeHandle_<ArduinoHardware, 25, 25, 280, 280> NodeHandle;

to

typedef NodeHandle_<ArduinoHardware, 25, 25, 512, 512> NodeHandle;

in 'rosserial/rosserial_arduino/src/ros_lib/ros.h' if you use the ATmega328P. Dont forget to run make_libraries.py. If you are using an arduino uno, think of upgrading to a arduino mega.