I imagine the splines are worn out in the handle.
If you put the set screws 180* apart, all the thrust will be on the set screws. If you can get them 90* apart, it will push what's left of one side of the handle splines into the shaft and I suspect hold much better.
FWIW, I couldn't get my handle to come off either and I didn't get too aggressive about it.
A slide hammer type puller may be what you need?
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