414 Dyno results: Missed combo?

Testing will resume on Monday. I didn't capture any video and intend to try a few more things. Not searching for power though, I just want to "know" this engine a little better. I also intend to try some 100LL Avgas as this engine did pump 190 on a quick , hot compression test. I hope it doesn't make more power 'cuz that will mean I have too much dynamic compression for true 91 pump gas. To be perfectly honest I think I heard a slight rattle @ 3500 rpm @ 36 total. Not sure though as usually an engine in detonation will come off the brake weird and sound like **** and struggle and have a wicked dip in the curve which this engine never did. In fact this engine exhibited zero dip at all which is pretty rare. J.Rob