DogCatMom made a great observation. Wearing only socks (or barefoot) so you can feel the wheel helps out a lot.
Also the placement of your foot on the treadle. Some wheels you need your whole foot on the treadle, some treadle well with just your toes on the treadle
Some wheels treadle fine using only pressure from your toe, others the heel and yet others need pressure from both toe & heel.
Just keep practicing and you'll soon find the sweet spot!