How to get my legs perfectly smooth?

Okay I use a very sharp razor and the skin mates shaving gel. I have tried many razors so don't suggest getting another. This is the best one I have found. So my question is what else can I do to get perfectly smooth legs when I shave? Also on certain parts there are these little blackish dots that look like the hair follicle. How do I get rid of that too? My skin is sensitive so I'm not sure that anything like nair would work. Last time I used the normal nair it didn't take any of the hair out and it burned so bad.