I am finishing off Powerfull/R4W this week. I am going to start a Drive/RPM stack with some DTH. Can I go right into the new stack or should I take a week off? Also I take 6grm Maca a day for Libido. I am thinking of adding Vitex. I took this before but only at 100mg a day before bed. I did not notice an increase in libido but I did notice that I was able to last longer in the sack. Even had a couple marathon sessions. Any experiences with Vitex?