In my limited experience my stiff board (raptor) is really fun and precise for the first 4 hours. The last couple runs of the day are the crappy part.
At that point fatigue sets in, and I haven't had the 100+ days of experience for my muscle memory to be there when I am not concentrating. The board will punish every bad form. I am at a point I can save most of those, but it makes a very exhausting end of the day.
“I train every day of my life as they have never trained a day in theirs.” – Alexander Karelin