I'm a bit over 6 ft(maybe 181-183 cm) with average length arms, it sounds like we are in a similar boat.
What helped me was backing away from the bar a little bit when pulling conventional. Shins for me don't touch the bar until I'm down and just about to start the pull.
Also trunk/abdominal and lots of lat work. The stronger your trunk, the easier it will be to hold your torso in a stable position.
Remember that not everyone's pull will look the same. As long as the lower back is not incredibly rounded and doesn't change dramatically in flexion angles during the pull you'll probably be fine.
A video would be helpful if you'd like any further guidance.