You should be able to work YB on 20M SSB with the Hexbeam and 1.5kW. There are a lot of YB hams actually. So you might try CQing on 20M at the times when YB is open to your area. On 20M its usually 23 - 02Z here in VT. 15M is also an excellent band for YB. Here the good window is 13 - 15Z. Almost always, short path is the best from here.
Also, don't rule out 40M SSB short and long path. YB has become much more active with DXers in the last decade.
Ed N1UR