So you finally got sussed????? :grin:
Despite the fact that penetration has always seemed to be dealer dependent, I've never known any dealer cut three decks off where I've played. I did see over a third being cut away when I played in London once, but that was as I sat down, so I don't think it was anything other than the dealer not being ar$ed to be more precise with the cutoff.
I started a conversation about a dealer I knew suffering from RSI as a result of a lifetime working the tables, and the more frequently she shuffled up the more it exaccerbated the problem - in the end she had to give up work. When she finally returned nobody would employ her anymore because they thought she would be a high sickness and insurance risk. That usually solves the problem.
Perhaps you ought to take some of your winnings and invest in some el-cheapo train/plain tickets to other cities?
Best wishes for the festive season and a happy (and profitable) New Year.