i have been working on a bowl out of Black Cherry Burl wood. Finding that this wood if much harder than any thing I have turned as of now. Been trying to get out of the rut of all my bowls having the same basic look. In doing so I have found the need of better chisels & differnt styles to allow me to reach the inside without having my chisels making contact on the upper lip of this bowl. Tell me what's the best type & style chisel to reach the inside when the upper lip is much smaller than the lower parts.