Maybe you can find a bike shop that will let you demo some bars (even if on different bikes). It does sound like the 42s are too wide for you. You might prefer 40s or 38s. Don't go too narrow because you need adequate side-to-side leverage to control the bike. I've got 38 shoulders and I much prefer 40 bars. I'm not familiar with many of the bars on the current market, but I recently tried some anatomic bars (while on a trainer) and didn't like the limited hand positions on the drops.