Some tailwheel questions/comments

This weekend I began my tailwheel endorsement endeavor and had a
lesson in a shiny 160 hp Citabria. It was great fun but the stick and
rudder forces seemed pretty heavy compared to the C-150 I am used to.
The trim was in an unfamiliar position and I didn't get used to using
it enough on the first flight perhaps. However are there tailwheels
that are lighter to handle than the citabria?
The other issue I was wondering about: does the position of the CG
shift when the tail is raised? So is the tailwheel more stable while
taxing at a higher speed on the two front wheels? In other words, I am
wondering if a tailwheel taxing with the tail raised has a similar CG
position to a tricycle gear airplane.