Left David 3 default, middle David 3 "one click weightmapped", right David 3 after weeks of hand-editing weightmaps.

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That "Merge All Zones to Weightmaps" button is complete nonsense.

All it does is do the raw "conversion" which only makes the cr2 bigger without adding any bending benefit.

"Weightmapping" a figure means to make use of the better granularity weightmaps can provide by carefully editing weight-and bulgemaps.

Basically you have to re-rig the figure from scratch as the only thing you can keep from the old rigging are the joint centers.

And it's a good idea to only "merge" those joints to weightmaps you actually plan to rig, because that way the cr2 will be smaller and load faster.

So, do not simply "convert" your figures to "weightmaps".

It will give you zero benefit and actually harm their performance.

Do the conversion joint by joint while you edit the weightmaps.