well from what you described all sounds good except one thing,"not running the light till stopped calling" most predators will show up in 3 to 10 min,waiting 15 to 20 before scanning the area with the light,you maybe missing them.the idea behind sucsessfull predator hunting is to see them before they see you.what might be happening is there showing up early and picking you before you know they have showed up.this is one reason i like snowless-dark nights,your able to pick there eyes from great distances,sometimes several hundred yards,this gives the hunter a big edge.with snow cover things are much brighter and its harder to pick there eyes untill there close.make a sequence of calls for 1 to 2 min and then start scanning the area with your light,move your head slowly from side to side.never jerk your head back and forth,slow deliberate moves only.you will be surprised at how fast a fox or coyote can and will show up sometimes,especially when dealing with grays.as far as cover scents,well some guys swear by them other don't waste there time.if your going to use a cover scent then use a skunk essence,if you can find it.its become hard to find in recent years.when dealing with grays cover scent are not nessasary,most times they bust in so fast from any and all directions it proves to not be nessesary.reds are a little more coutious and alot of times will try to circle you so a cover scent can help but i personaly never had a luck with fox urine.if i felt it nessasary i used skunk scent.now when it comes to coyote, never had any luck using any kind of cover scent.i have even heard reports that fox urine accualy spooked coyotes.coyotes have the amazing abilty to disern many scents at one time.even with a strong oder like skunk they can and will detect your scent mixed in there and leave the area faster then they showed up.the most important thing here is to always use and be awear of the wind.if the wind swirles or shifts and they(fox or coyote)get a nose full there going to spook regarless if your using cover scents or not.but if they seem to work for ya then by all means use them.now before i say anything good or bad about elec callers,do you have any hand calls???if you do practice with them and try using them over the elec caller and see if it makes a difference,it just might.you need to be skilled with both types of calls but in the long run you will see that hand calls consistanly produce more responces.when using the challange call for coyote your automaticly elimanating any responces from young and or juvanial(sp)coyotes,they do not and will not come in to get there butts kicked.if its used right you will bring in alfa males to run off the intruder.one thing you must relize about alfas(male or female)there smart,cunning,slick and very hard to fool.they have been around for at least several years,problably been hunted-shot at-chased by dogs,in other words there educated.these guys will put the skills of any hunter to the test and most times come out the winner.generaly speaking when dealing with adult coyotes,don't speak untill your spooken to.unless your using a group howl tape for locating purposes only,at this time you can speak first.a howler hand call is also very effective in bring in coyotes when used in conjuction with distress calls.i find the higher pitched howlers to be more effective at bringing in yound and old coyotes.the deeper older sounding howlers will make the young ones hold back for obvious reasons.i carry both types,the deep one for those always exciting challange situations.an important thing to know when working reds is there volume sensitive.when targeting reds always start your calling sequence off at low volume,if nothing shows in side of 5 min then crank it up slighly for a few seconds then bring the volume back down.as a red comes in or if you set up right on top off one,loud volume will couse him or her to hang up amd ultimatly leave the area.hope some of this helps and remember when you don't have an experienced caller working with you its a hit and miss learnig experience.stick with it and in time you will get the hang of it.