I have been shaving now for about a year, and I just had a few questions:

I started touching up my own razor with a polishing stone about 3 months ago, and have been very satisfied with the results. I have found though, that I am having to touch up my razor after only about 3 to 5 shaves. Is this normal? it seems that I am having to touch it up on my stone more than I should have to. I shave about twice a week, and have coarse facial hair. When I do touch up my razor, I do approximately 75 passes in order to get that nice edge on it, but it seems to go away very quickly. should I take my razor in to get it professionally resharpened periodically still, or is this a problem with my razor or stone?

Also, I have gotten very good at shaving all parts of my face, except for my neck. My neck is ridged, the skin seems to be very thin, and the facial hair there is the coarsest on my entire face. It is to the point that I rarely can do a single pass without bleeding or receiving razor burn in some way. I have tried multiple techniques, but none seem to work, are there any tips or pre shave prep instructions that I could do to either toughen that skin in some way?
I shower and condition the hair before I shave every time, as well as build lather on my face. I have tried starting with my neck as well as ending with it. Could this possibly have to do with the same problems that I'm having with my razor? I usually let my face rest for about 3-4 days before I shave again in order for that skin to heal. Please help, I love this hobby, and this is the only discomfort that I feel, but it is a major one.