if you've been hunting the same spots for more then 2 times in the past month, you're beating the area to death... it seems like you know 1/2 way what your doing by the 2 fox last month...
get into the new areas and let what you been hunting rest for a while...
walk in, let the spot settle for a few minutes while you quietly set up... I always start with a mouse squeak in case I walked in close on fur, then start the calling sequence... call intermittently for 20-30 minutes... if nothing shows one more set of mouse squeaks then silently get outta there...