So I already know the stp40nf12 wont do what I want, but Its not so much flicker effect I guess more pov kinda thing, the default pwm freq. On the attiny85 was 200hz and the flickering was really bad, atleast to me, changing it to 15khz fixed that
the problem isn't while looking straight at it, but if you move your eyes quickly it tracks across your vision, which since this is being designed to possibly be of automotive/truck use where while driving your eyes move around quickly as well as other drivers seeing you pass quickly(I hate most stock led taillights because a few manufacturers use pwm to dim the lights and on some cars its really annoying to see that pov effect while driving)
Now would that mosfet u suggested be able to do what I want? Its input capacitance is higher than the other, but I guess with the ultra low gate threshold its better?