I'm not sure you are staying on stand long enough billy8point. Calling for maybe a minute or two and then waiting for 5 to 10 minutes may be only half as long as you need to stay on stand. I'd also recommend doing just a little bit more calling. Say call for maybe 45 seconds to a minute on low volume, wait 2 or 3 minutes and then do another low volume series for about a minute. Wait 2 or 3 minutes and then do a louder series for a minute.
I'm not sure how far the sound of your call will carry in your location. If you have lots of timber or lots of hills, the sound may not carry very far and you may get by with staying on stand for maybe 20 minutes. If you have more wide open country, I would recommend staying for at least 25 to 30 minutes. If you start using a howler, you may want to stay even longer. Howlers can generate a lot more volume than most distress sound calls, so they reach way out there. It sometimes takes a coyote quite a while to meander over to your calling location. They get distracted by rabbits, mice, birds, etc. and you have to be making some calling sounds to get them interested again. That's why I recommend calling more frequently instead of waiting 8 or 10 minutes.
Also, if you have been following threads on this board about setting up to call, you no doubt should be paying particular attention to wind direction, approaching your calling site silently, setting up in shadows if you can, etc. If you aren't sure about proper set up techniques, then do some searches on that topic and do some reading.