I like the contrast of the two timbers, and you're right about the rim, it's way too heavy. There appears to be a grain mis-match in the iroko, which suggests that you cut the original rim away, slid an ash ring onto the bowl and then replaced the rim....is that how you did it? If you did, it would have added to the piece if you could have matched the grain on the rim to the grain on the bowl.
Les