The way I know basic martillo beat two is open on the macho and beat 4 is open on the hembra.
In this video it looks like you are making the mistake of not leaving the thumb pressing on the head while striking with the right hand on the macho.
http://12.204.110.67/temp/sample/martillo2.mp4The thumb strikes on the 4&, then the thumb must stay pressing for the strike on the 1. Then the fingers, then an open tone on the two. Then repeat, except for changing the macho strike for the hembra.
1=right macho strike with thumb pressing. 1&=fingertips, 2=right open strike on the macho. 2&=thumb strike remains pressing.
3=right macho strike with thumb pressing. 3&=fingertips, 4=right open strike on the macho. 4&=thumb strike remains pressing.
I can't open your latest video. Keep practicing, you'll get it.