When you say "maintain the profile," are you talking about thinning behind the edge, or are you talking about the bevel and edge itself? The words point to the former, but the next sentence implies the latter. I'll give a piece of advice that would apply to both: keep your pressure gentle unless your purpose is to take off a lot of metal. A big part of my sharpening journey has been toward being able to use much less pressure, which also increases my accuracy.
I can feel very tiny burrs. Some of that may be finger sensitivity, but I think a lot of it is practice. Try using each of your 10 fingers in turn. You'll probably find, as I did, that some of them are much better than others at feeling burrs, and the winner(s) probably won't be the more-calloused forefinger and thumb. To best feel burrs, you are moving perpendicular to the edge, and toward the edge.
I have not found the heel to need extra attention; it seems to come along for the ride (exception: knives with bolsters). The toe, on the other hand, seems like it should need less attention than the rest, but it seems to want more, at least in my hands.