CW might be the best way to QSO on 160M with smaller antennas, and 100W, or less. That, and maybe FT8. My experience on 160M is, unless you pound them with at least an S20/9 signal, they don't seem to want to have much to do with you. They call it 'The Gentleman's band', but I see it more as a band of smugness. Just my take. One of the reasons that I like the newer 60M band. You are on par with everyone else at 100W, or less. That, and 60M is open 24/7 to somewhere.