Roy's got ya pretty well covered i see! Congrats on getting her tillered out. A rasp will shape that handle pretty quickly (too quickly if you're not careful!!). Start with rounding off the edges as Roy said, then you can grip it and feel where wood needs to be removed, continue until it feels good.
When i got started, i looked at as many handles/grips as i could via searches, and decided what i wanted mine to look like. Smooth contours and graceful lines win the day (though sometimes I still have one come out not quite how i like it). That's the fun of experimentation though!
Looks like you're well on your way to a full fledged addict :D
I have no doubts your next one will be right at the goal weight