It took me 6 trackdays before I finally got my knee down, don't rush or you will crash.
First thing you need to do is have your suspension set up for track riding. Typically costs $20-30 and they take measurements with you in your full riding gear sitting on the bike. If that's not happening, they didn't set up your suspension properly. Suspension is important or you will crash.
Second you need to practice somewhere safe, especially since you have kids. A trackday is best(runout/ambulance/clean surface). Does the ramps your using have guard rails, rocks, trenches? Don't drag knee there!! No way. Only attempt to drag knee on ramps that have smooth runout area to crash into. Parking lot can be pretty safe, but evaluate light poles and how clean the surface is. a lot of parking lots are very dirty.
Third, another reason trackdays are best and a long twisty road is ok, is because they get your tire hot. Not just the center, but the edges of your tire which is very important. You don't want a cold tire crash.
Fourth, body position is all good. But you need enough speed to actually get enough lean angle to drag knee. Like I said, it took me 6 trackdays to reprogram my brain that it was ok to dive into a corner this fast. And I actually screwed up and entered the corner hot( too hot for me) and low and behold the knee is dragging.
Please don't make dragging a knee a priority. Just let it happen, enjoy riding and it will come in time. When I ride on the street and my knee touches down, that's my cue to slow it down. Dragging knee on the street in most cases is not safe, think of where you'll go if you crash. Guard rail, rocks, hill, ravine, into opposing traffic, etc....
Also, I run a 55 profile tire(raises the bike), run very stiff suspension and raised the rear of my bike 1" with dogbones to increase ground clearance. So what you did to your bike will not keep you from dragging knee.
Trackday, trackday, trackday