I am new to hammocks and to start with my tarp is going to be my noah's tarp. I have never set it up with anything other than a paracord ridge line. I have been playing around with putting two prusik knots on the para cord so that adjusting the tarp is easy, but they tend to slip (probably because I'm using para cord for the prusik knot and the ridge line). Can someone recommend to me the type of cord that they use for their tarp ridge line and prusik knot?