: Rounded was the original plan. The trick was the tips went on after
: most of the carving was done (paddle was coming out a little too
: short). Tips turned out to be easy to add even in that
: situation, so I figured if I don't like it I can swap them out,
: but 1" tips didn't lend themselves to rounding.

I'm with the other commenters here - I think it'll behave better for you if you round off those edges on the tips.
For reference, the picture here is from Superior Kayaks webpage and it shows how they do the ends of their paddles. This is close to the shape I've done most of the paddles I've made. And, I think this type of rounding would be pretty close to fitting within your glued on tips.

-John