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Recommendation for bottom of bowl gouge?

I use a 5/8" D-Way BOB ground at 70 degrees. I am going to get a 3/4" for use on larger bowls. The 5/8" works but tends to vibrate too much with a lot of it hanging off the tool rest. I also have a #5 Badger and that is a great tool for steep side transition. I got that after watching John's video and it is a great tool.
I find it interesting that some turners are using an BOB ground to 80 degrees or more. I have tried that and found it to be tricky to use. Maybe I need some tips on how to use that grind?
 
Don't think it has been mentioned, relieving the heel is needed when the transition from bowl side to bottom is less gradual. Keeping the bevel floating while moving through the transition can cause the heel to put pressure on the wood, burnishing it. And burnished wood requires extra sanding to remove.

Haven't done so with my 70 deg bottom feeder, but when I've darkened the bevel of a spindle roughing gouge with a magic marker and taken light shavings along a round spindle, the marker ink is rubbed off 1/32" or less below the cutting edge.
 
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