More feedback - Weidmuller Stripax seems to fail on Romex - see reviews - https://www.amazon.com/dp/B00KP1R1BA/?tag=atomicindus08-20
And back to Knipex - the lower cost Knipex 12 62 180 appears to show excellent results with Romex at least to 12 gauge. - 12g Romex with excellent results -...
I think there is a viable solution for both the outer sheath AND individual wires: search for KNIPEX Tool Tips - Why use the 12 64 180 to strip Romex and get this video:
https://www.facebook.com/knipex.us/videos/knipex-tool-tips-why-use-the-12-64-180-to-strip-romex/287619139270220/
But - the...
Farm use Stihl MS660, used for 15 years now primarily with cheapo Super Tech Universal 2-cycle - works like brand new. That should settle the question. Sent saw to the shop twice for replacing gaskets, but I don't think that is related to engine oil. If I find scored cylinders or other problems...