When you say all of the lower leafs, how much is usually left at the end? We had a pretty bad success rate comparatively.
I just plant 2-3 nodes under the media and leave maybe 2 nodes above. leave some smallish leaves on the growing tip.
Pears tend to strike relatively easy. I have found that about 1/2 never put
enough roots out before growing too much leaves. Still, 50% is not that bad. make sure you use 1 year old or less growth. If you wait for winter you can use older
wood with even better success rates but it looks like you have plenty of growing branches on that tree to work with.
air layering will also work like others have said but that's a lot more work for a tree that strikes so easily. I prefer to pop some sticks into the dirt and keep moist.