To answer part 1, I often tie streamers as small as a #12 TMC 300.

To answer part 2, I took a look at my hook boxes and my streamer box. I guess the hook I have recently used the most, mainly for Clousers and Crazy Charlies, is a TMC 8089.

Strangely (at least to me) in looking over the hooks I noticed that the #10 TMC 8089 and the #2 Mustad 3366 are very close in both size and shape. Hmm.

Spyderman