When do you notice that the toe is less keen? If before stropping, check your stroke, like was said above watch the water and feel for a difference in the feeling of the toe on the hone compared to the rest of the edge. It can be very subtle but you will be surprised how the feedback can tell you a lot about whether the bevel is consistently polished.

If it seems less sharp after stropping but fine before, check your stropping technique. I had a similar problem where the heal and middle of the edge would be sharp and progressively after a few shaves the toes was noticeably behind the rest of the blade. Turned out I wasn’t getting the toe near as much as the rest of the blade while stropping, a slight adjustment to my technique cleared up the issue.

Hope this helps.