I don't know it's just me or what. I had several hohner 270 and find the hole 2 difficult to play.
After switching it to Discovery 48, which has a plastic comb, the hole 2 can be played easier.
Then, I switch to Chrometta 12, the hole 2 has both powerful blowing and drawing sound.
According to what I encounter now, it seems plastic comb allows you to have a easier lower octave playing.
I don't have many wooden harmonica to test on, so maybe you guys know.
p.s. I also tried a hohner masterclass before and after changing to a plastic comb. The lower octave becomes easier to play after changing to plastic comb too.