paused benching, cambered bar benching, dumbbells are good, incline benching (increased ROM, helps bottom end), overhead pressing (works lats)
lats help at the very bottom--get them lots stronger, work on technique (pushing out on your arms and trying to spread the bar helps activate them).
pectorals work as well--as the last item in the checklist. Pecs can help in the midrange, can also sorta help in the bottom end too but they're far secondary to lats. I'll bet diamonds to dollars it's lats, back, technique, and shoulders first.
If you can find them and your shoulders/elbows don't hate you, definitely go for cambered bar benching.