This is symptomatic of an underlying difference between ‘Celtic’ woodwinds and orchestral woodwinds, obvious to a player but difficult to put into words and difficult for people coming from the ‘legit’ woodwind world to master.
The main thing is that on orchestral/legit woodwinds each note is an individualized precious complete distinct entity, with an attack, core, and decay. On bagpipes the notes flow out of the instrument undifferentiated and with little individual value, and much of this style has been incorporated into the flute and whistle. (Setting aside the staccato possible on the uilleann pipes for a moment.)
Cuts and pats are NOT ‘notes’ in the orchestral sense but rather articulations or interruptions of the flow which take up a far shorter amount of time than any note could possibly take up in orchestral playing.
If you can hear their distinct pitch they’re too long! Pats should sound like an instantaneous ‘pop’ or blip.
One problem is finger height. Orchestral woodwind players, Boehm flute players and sax players, are taught to keep their fingers very low, in contact or nearly in contact with the touches, in what is called their ‘guide positions’. Moving a finger from its low guide position, onto the surface of a whistle, and back, is going to sound far too sluggish.
Getting sufficient speed requires distance, and you’ll notice whistleplayers, a split second before the pat, lifting the finger high above the whistle, and snapping the finger with a lightning quick motion.
Getting cuts quick enough simply requires much practice. Don’t try to shorten the duration of the cut by lifting the finger just a tad! Getting a clear-sounding cut requires the finger lifting quite clear of the hole. When I do cuts the finger comes up around an inch. There’s no substitute for sheer repetition and practice.
I’ve taught many many Boehm flute players, recorder players, sax players, bassoon players, etc etc how to play pipes or whistle or Irish flute over the years and this is something they all have trouble with.
Whatever you do, don’t think of a roll as a turn! Rather three melody notes separated by a cut and a pat, these being so short as to take no value away from the melody notes.