If you have been successful pollinating with a paintbrush, I see no special advantage to switching to detached male flowers. If you do want to try the detached male flowers, what seems to work just about every time is to use about three males per female flower. Detach the male flower and peel off the petals so you are left with a short brush. You can use them one at a time or bunch them all together and swirl or dab around inside the female flower. The stigma of the female flower is sticky and will readily grab the pollen grains.