Never been fast enough to hide flaws.
I always heard, slow and smooth, smooth and fast.
Dear Seiser Sensei,
Hope you are well. Perhaps you could have added this to the above; with the intent to do the waza as near a technically proficient as possible.?
My belief is this you only improve when you do a correct movement be it fast or slow .Fast movements can hide flaws , as you have indicated.Slow movements allow one to know/focus on where there are' gaps 'in the waza that one is executing.Cheers,Joe.