I suspect we are both right - ie there are valid reasons for both spellings. I encountered the Yeshua spelling first (in Aramaic, and in Hebrew), so I have tended to "research" it more -- the "Fit" with the 7 Candles in the Menorah and 12 loaves, the upward paths in the Tree etc all seem to jive. Ditto for the 288 fallen sparks in Judaism and its connection with the fall, and Jesus' name (288 + ...). The row lengths in the Periodic Table was one of the (for me) appealing links.
One of the people I teach with, like you, prefers the 391 spelling, so I am familiar with it. (But have not done even a fraction of the work on it you have).
One of my own "theories" (and that is all it is) is that the 386 is connected with God's 4-letter (26) name in several ways, one of them being that 386 is just one more full circle (360 degree) cycle around the same spiraling wave of Divine energy.