honestly, the bad answer you don't want to hear is the right answer; it just takes practice. I have a few razors that loosen up and I tap the pins tight every once and a while. But sometimes they're loose and I don't realize it until I am going to strop with lather on my face and a towel around my waist.

try to keep your thumb on the tang facing up to the ceiling at all times and your forefinger on the bottom at all times. After some practice you'll be able to adjust your fingers while turning your razor. Keep things slow for now, this isn't a race and your edge and strop will be grateful.

How high/low is your strop? Are you keeping it perfectly horizontal or at an angle? What works for me is kind of weird but I hang the strop waist high and hold the end of the strop higher than where it's hooked on to the door.