Just thought I'd add my findings, I am not using the Gov but I have it enabled to get RPM from my Castle ESC.

My logs also have a number of "RPM Sensor noisy" messages though not full, maybe 5 to 10. I'll have to count.

Just for your information. I use a Spirit Pro on my velos880 with a HW platinum 160A v4.
I do not have rpm sensor noise problems.
Sacha

First try with my HW 60A V4 I couldn't get a reading until I bumped the filter to 9 - Never checked the logs...

Upgraded to HW firmware PL-4.0.03, filter down to 7, no problem with my low HS Warp
(nothing in the logs except good health, gov engaged etc)

Just bumped filter down to 6 (default) quick spoolup, everything works, nothing in the log...

Cables are a bit of a mess, still no problems.

Just my 2 cents - no issue with 130a HW Platinum v4 and Spirit gov

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DX9 - Chase 360 - Spirit