I think it’s awesome that you’re doing this - thank you! 
The added weight suggests that it may really be able to provide 800 Watts of cutting power (more than twice that of the Dewalt). Did you get any specifications or performance curves for it? Maybe take and post a picture of its label? I think that properly sized stiffer Z axis spindle lift springs (if available) should make it fully compatible with stock Shapeokos.
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