I had similar concerns some months ago, I even posted here a question to compare Jones and the Highlife in pow, as I felt that the Highlife under-performs in deep fresh (it floated but at cost - back leg burner) and also considered switching to Jones Flagship, given the similarity in the other aspects I liked in the Highlife.
However, I moved the bindings to the back and since then I don't have any issues, maybe I also got used to the board...
The board is a killer super fast in pow as well, just with a centered stance it is harder to keep it on top. If I were you I would keep the High and buy a powder specific (something like Charlie slasher) - now the 2013 models on sale (you can find 50%) are cheep and will be close to the money you will lose if you sell the Ride and buy new Jones/Rossi which are similar to the Highlife
I have the 158 H UL, I am 70-75 kg.