The CT is a numbers plane, its slick with the nose down, dirty with the nose high and power off, so the best approach is flying the numbers for the configuration. We start our students at 15deg and 0 flap until they are able to maintain a steady glideslope and approach speed and figure out where the ground is to time the round out and flare appropriately. Common errors in the CT landing is ballooning by an over pitch at the transition from the round out to flare, failure to recognize elevation above the runway, or failure in maintaining an appropriate altitude while reducing speed to touchdown speed near stall. Using 15 or 0 flaps allows some addition time in the flare while the speed is depleting for touchdown, and yes if you are patient and continue increasing pitch as speed decreases then you should touchdown near stall speed. If you are not patient enough in increasing pitch while reducing speed you will touch flat and may bounce and get a second landing practice. If you cross the runway threshold above target approach speed then you will have to work longer in the flare to reduce the speed to near stall touchdown and float further down the runway (long runway or long landing desired, no problem just takes longer). Cross the threshold to slow and the transition from round out, to flare, to touchdown will be very timely, firm if not timed correctly, or over pitched because of rapid sink, followed by a balloon then quickly run out of airspeed. The CT with 30 or more flap is certainly manageable with the appropriate airspeed and is not terribly difficult once you have mastered the sight picture for round out and flare. However, the CT is very easy to balloon during the initial round out with 30 or more flap when it hits ground effect. You have to make a smooth level off, almost pause for a couple seconds until a little sink is observed, then continue with pitch increasing into flare. With 15 or 0 flap this transition is a bit easier plus if a balloon occurs it is easier as an instructor to salvage it into a go around or landing. With 30 or more flap the instructor has to really be close to the throttle as it can quickly bleed speed during the balloon.