Dave,

Your speed on downwind is fine, it allows you to mix with other
airplanes. Suggest you just pull the power back further when you make
the initial reduction and then quit looking at the m.p. gauge and use
the power as you need it to descend and hold your speed where you want
it. Speed control is utterly essential on tailwheel airplanes. It's
okay to be decelerating through the pattern and nail the speed on
final. If you're fast, close the throttle and slow down, using a
forward slip if necessary, although with a little planning you won't
need to slip the airplane. Wait until you are on final for the prop,
out of consideration for the folks around the airport. Make sure the
throttle is closed before you go into the flare and then strive to get
the stick all the way back to the stop before touchdown. It may mean
that the tailwheel touches first, but that's perfectly fine, it's
designed for it.

Have fun finishing the checkout.

All the best,
Rick