Aside from the TPS adjustment on my SV, the Crampbuster went a long way towards progressing my throttle control. Others may have differing opinions (see above). For the money, though, even if you find you don’t like it, it’s a relatively cheap experiment.
But I would definitely get that one-finger thing checked out. Reynauld’s syndrome (if I didn’t butcher the spelling that’s a miracle) comes to mind.