I agree with Xman. I don't think the angle is an issue if your technique is correct.
Make sure you have some draw on the leather side. If it is glossy slick, you probably have little or no draw and the strop isn't doing its job. You'll find some threads in the Strop forum discussing how different members treat or break-in a strop with sandpaper, pumice stone, etc. Not all strops need it but it's something you might need to consider. I lightly rubbed mine with my DMT 325 and it made a tremendous improvement in the draw.
Also, I don't believe that the "less is better" mantra you hear regarding honing is applicable to stropping. If you need to apply a little pressure to feel a draw, do it. If you have to apply a lot of pressure to feel a draw something is wrong with the strop.
After roughing up the leather side and starting to apply a little pressure when stropping, I find that the edge is staying shave-ready longer.