How did you find it at Klewenalp?
I'm not in the Basel area but usually am up for heading out from Lucerne on a weekend for a day trip. (Hasliberg, Melschee Frutt, Engelberg, Sorenberg, Andermatt have been some in the past. Although I'm always keen to try new places)
You're welcome to join sometime from Basel if it suits.
Your on-piste skills sound similar to mine (although I probably have even less style!

) but I'm not an off-piste skier....yet.