Four of us from ICCC went to the Como/Ticino area in 2014. We used Simon Flowers' book, and you can find our trip report here: https://union.ic.ac.uk/rcc/caving/articles/switzerland-2014-09-14.html
Note that Simon's book is often quite badly wrong, either because the local guides have chopped and replaced bolts in different places, or due to some other source of error. This caused us some serious problems in Val Iragna. I recommend taking laminated photocopies or a waterproof camera with photographs of the book.
I definitely recommend Perlana Inferiore near Lake Como as a good start, the underground section is very atmospheric. Cresciano Inferiore was so good we went back twice, but it was a bit more technical. Val Grande was tough and Val Iragna was almost quite dangerous given our experience level, which sounds similar to yours. We saw tour groups in all of these canyons.
Hope that helps, there's a far more detailed description and photos in that trip report.