The contrast looks ok to me, as rendered in the flicker post, but it's a little hard to judge from a posted scan. You can tweak the contrast by increasing your agitation or the total development time. Getting to a time that fits the way you would like the negs to look will take a little experimentation.
To boost the contrast a little, try adding 30 seconds to 1 minute to the development time and see how that looks.

Most scanning questions are OT for apug, but you will find lots of help for that in the dpug sister site (