CRJ?

Bombardier completed in flight icing tests and transport canada and the faa determined the CRJ did not require stab/tail fin anti icing.

Why exactly does the tail pick up more ice?

The sharper (or pointy - er) the surface, the more ice accretion.

Today's pneumatic boots don't need a build-up before they can effectively remove the ice.

If you see ice, blow the boots frequently (especially before configuration or speed changes) or put them in auto if it's available...