FRUSTRATED

I know you folks have probably read this time and time again, but I am seriously at a loss here. I build turf equipment for a living, and also help a friend out doing a little lawn care on the side when he is short handed. I also rent his house so I have full access to his equipment when the yard needs mowed. Just got done mowing it with his exmark 60" and I am having a horrible problem with divots. Someone may not believe me, but my pivot wheel is in reverse at a speed that looks pretty close to my outer wheel when turning yet I STILL leave a divot. I make 3 point turns when possible, but some areas are just too tight. To paint a picture for you, when I can't do a 3 point turn, I come to the end of my stripe, I slow down, and come to a stop. Pull both control arms back to get both wheels in motion (all the while staring down my pivot wheel) slowly pull back the arm on my pivot side to start the turn, then ease my outer wheel arm forward to complete the turn. Still a fairly good divot. Am I missing something here? Still fairly new to the lawn care side of things, so lay it on me. Luckily it's my yard this is happening on and not the commercial properties. Ugh. I'm broken.