The energy of the impact is nowhere near as important as the spinup time. If it takes 20s to get up to speed it is not going to be very good.
Sounds like your armor isn't very thick, or is made from something very light. On our spinner we have 10mm hardox 500 and 15mm aluminium.
Also our design is almost all bolted. The only welds are to attach the teeth to the spinning ring.
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